My X-men recommendations- I've got 70+ more to add to this list
10th Century Boys series by khaleesian on AO3 - two stories 50K ~viking-au, ~powered Erik the viking kidnaps little saxon Charles to be his thrall (slave) and takes him back to Norway.
A Family Portrait in Progress by Xris on AO3 - series 47K ~canon-au Charles adopts Lorna, then slowly reconcils with the rest of his estranged, extended family.
A Curious Carriage of Crysal and Cold by etharei on AO3 - 117K ~space-au Charles, a miner from a poor village in the countryside, saves the life of Erik Lehnsherr, scion of a successful business family and the richest man on the planet Eisen. Charles is a telepath and somewhat anxious about it, while Erik abstains from relationships because the lights flicker and doors open and electronics vibrate when he gets too excited.
A Gentleman of Negotiable Virtue by Not_You on AO3 - series 17K ~hooker-au, depowered Wheelchair-bound Charles visits Shaw's brothel to be with his favourite prostitute, Erik. He thinks Erik takes pity on him for his disability, but the truth is far more complex. Then Erik kills Shaw...
A Moving Sea by Anon in kinkmeme ~shark-erik ~dolphin-charles ~sea-creature-au Charles and Erik band together to fight a deadly squid. Happy ending!
After Hours by Lustmonster on AO3 - 26K ~serial-killer-au, powered, modern_au Charles and Erik are serial killers in their city that have been corresponding for years but never met.
All the King's Man by pookaseraph on AO3 - 64K ~depowered, steampunk-au, Erik-in-charge, Erik-to-the-rescue, Captured-Charles, Alpha/Omega verse, star Charles is a courtesan in King Erik's court and catches the King's eye. This is absolutely brilliant, romantic and also has some non-con. Shaw is his usual bastard self and Emma is Charles's confident and friend.
All the Worlds In Between by manic_intent on AO3 - 29K ~au-meeting, cerebro-addiction, au-spies, star, team-raven-charles Charles and Raven discover a handsome cat. I absolutely adore this fic. It's one of the best at showing how Charles could get addicted to cerebro that I've read.
An absence which could not be more there by aesc on AO3 - 18K ~modern-au, powered Charles breaks up with Erik. Then one day, Erik reads an article about telepaths not being able to live with non-psionics who can't cope with their telepathy, and realises it was his fault.
An Ideal Grace aka The Sonnet Series by nekosmuse and alfrocurl on AO3 - 83K+ ~modern-au, depowered Erik is a poet and a new visiting professor. Charles attends his lectures after losing most of his own students to Erik's classes and gets mistaken for a student.
At any time by musical_emjay on AO3 5K ~modern-au, depowered, charles-you-slut Erik sees the boy on the train and they have sex. Erik thinks it's just a one time thing.
Be it Farenheit or Centigrade by twelve_pastels on AO3 3K ~Charles-alpha, Erik-omega, canon-AU Erik is glad that he didn't have his first heat till after he'd escaped Shaw. But Charles is the most powerful Alpha he's ever met and he doesn't want to be mated.
Beta-Omega dynamic by anon on the kink meme ~powered, alpha/omega dynamics Charles is an Omega who's terrified of heat and Alphas. Erik is the Beta who sooths Charles through it and finally gives him what he needs.
Bifurcation by spidepiano on AO3 ~doctor-au, depowered, modern-au Heart surgeon Charles makes an error, leaving him at the mercy of ex-boyfriend pathologist Erik.
Biological by Cesare on AO3 - 2.3K ~robot-au, de-powered Erik is visiting Bionika and is shown a lifelike robot, rejected by the Xavier Institute and ready to be repurposed as a pleasure model.
But the cat came back by twelve_pastels on AO3 - 3.8K ~au-modern, powered, crossover-sherlock Erik finds a stray cat on his doorstep and takes it in. Little does he know that the cat is actually is transformed ex-boyfriend.
Building Bridges by ximeria on AO3 - 17K ~powered, au-mansion Tony Stark is asked by his old friend Charles Xavier for some help in making modifications to the building where he'll be opening a school. Tony asks one of his Engineers, Erik, to help. Erik hates Charles at first sight.
Cages by etirabys on the kinkmeme ~dom-sub-au Charles has to make Shaw's Sub come, but the Sub has to stay in his cage. This is beautifully written and has great world-building and a gentle ending.
Caw Caw Motherfucker by ceilingcharles on tumblr ~crow-au Erik is a crow who has adopted Charles.
Charles's Killer by - heroes_for_ghosts to 13 parts ~depowered, modern-au, charles-captured, erik-to-the-rescue Erik is a serial killer, Charles is the detective who has to discover his motive. This story is told out of order but there is a master post of chronological parts.
Chessmen series including Boden's mate by Kaydeefalls on AO3 ~crossover-inception Charles haunts Erik's dreams, and might really mess up this extraction job his team are on. Multipart very long series of several stories.
Club Avalon by stewardess on AO3 20K ~bdsm-club, switch-Erik, switch-Charles, powerered Erik is a DM in a Leather Club in the 70s. An 18 year old Charles arrives, wanting to learn everything.
Curve Fitting by kianspo on AO3 23K ~de-powered, modern-day-AU Charles adopts Erik as well as Raven, but by the time Erik realises he's in love with Charles, it just never works out. Then Erik becomes a civil engineer and consults for the Army
Do You Love Me by cgf_kat ~Mpreg, distopia Charles and Erik were paired up as teens in a post-apocolyptic world, due to Charles secondary mutation. Many kids later, they realise they love each other when Charles is diagnosed with a brain tumour.
Deep Cover by subtitlor on AO3 35K ~kidnapped-Charles, erik-to-the-rescue, omega-verse, notpowered, modern-au Shaw kidnaps omegas who are just going into heat to use in his brothel. Erik is the detective and alpha hunter is is watching everything unfold on CCTV.
Downtown by so_shhy on the kinkmeme ~Erik-prossie, Pretty-Woman-AU Charles is a bit rubbish. That's how he ends up getting directions from a male prostitute in an unfamiliar city. An almost exact Pretty Woman retelling, but it's really rather good.
Enigma by Yahtzee on AO3 11K ~de-aging-au, timetravel-au When Charles dies, Erik finds a mutant who can send him back in time to say goodbye. But Erik has to give up the thing he loves most.
Erik Lehnsherr and the Rats of NIMH by winterhill on AO3 - 29K ~powered, ~nimh-AU Lonely Erik finds an intelligent, telepathic rat and lets him stay as a pet.
Everyday love in Stockholm by tahariel - 132K ~epic, ~the-brotherhood-rules-okay Magneto is the ruler of the posthuman world.His only secret? Charles Xavier, the human he's kept locked in his bedroom ever since his right-hand woman, Mystique, came to him pleading for mercy for her stepbrother, who accepted her mutant form and protected her as a child.
Everything is about a love song by pocky_slash 19K ~powered, old-men-fic Erik is 79 and is tired of leading the Brotherhood. Isn't it time he and Charles ran away together and lived happily ever after?
Fallout by gryvon on A03 ~apocalypse-au, mutant-recruitment Charles survives a nuclear war, but is he actually a ghost?
Feline persuasion by Unforgotten on AO3 - 1.4K ~modern-au, depowered Charles and Erik bond over cats and bad jokes about disability. Adorable.
First Breath after coma by oxoniensis - 23K ~fix-it-fic, charles-in-hospital, depowered Charles wakes up to find he's been in a coma for two years, and the world he thought he lived in is a lie. He's still a professor of genetics, but there are no such thing as mutants, there is no such person as Erik Lehnsherr. But why can Charles still read minds?
Fool me once, fool me twice by musical_emjay on AO3 - 50K ~incest-au Erik is Charles's long lost father. But all Charles can think about is seducing him.
Fools rush in by LoveSupreme on AO3 - 84K ~coffee-shop-au Erik owns a coffee shop and hates everyone. But when he falls in love with the scruffy professor who walks past his job every day, he's hard pressed not to turn into a stalker
For I mean to conqeur Troy by twelve_pastels on AOL - 34K plus art here ~charles-in-a-coma, Erik-to-the-rescue, the-helmet-is-cursed, Professor-lensherr, mansion-fic, star Charles overloads himself when using Cerebro and manages to call to Erik for help before slipping into a coma. Erik has to take over the school, but occasionally writes letters to his comatosed friend. Just lovely.
From Westminster With Love by thehoyden on AO3 - 16K ~powered, ~MI5-au, ~erik-to-the-rescue Major Erik Lehnsherr of NATO is brought in to assist in a mutant slavery case and meets The Mutant Who Sleeps Under Westminster.
Frozen dreams by paperstains on AO3 - 33K ~powered, future-fic Erik wakes up in the future after having been frozen. His doctor happens to be a distant descendant of Charles Xavier and shares his name. This naturally freaks Erik out.
Hamsters by ceilingcharles on Tumblr ~hamster-au Raven notices that one of her hamsters, a pudding dwarf, keeps trying to get fit to impress his sleeker cage-mate.
Handicap by castles on AO3 610 ~canon-au Very short but powerfully upsetting.
He's been gone for such a long time by fengirl 88 on AO3 - 5K ~fix-it-fic, ~beach-divorce, ~the-brotherhood-rules-okay Erik goes to the Discon convention looking to recruit mutants. Unfortunately Charles isn't there. Not that Erik's pining or anything.
High and Dangerous by fourfreedoms on AO3 17k ~football-au, depowered Erik is a German foodballer who's called up to play in Arsenal. Charles is an established player, who befriends him.
Hold your own, stack your stones by primetime on the kinkmeme ~mulan-au, dom-sub-au Charles replaces his Dom sister, Raven, in the Army. But when he is badly injured, he is soon unmasked as a sub.
Hollow Minds and Dead souls by Helens78 on AO3 54K ~canon-au, zombie-au While on their recruiting trip, Erik and Charles stumble on a zombie outbreak. Only thing is, the zombies neutralise their powers.
How To Be Co-Ruler-Of-Your-Own-Country by luchia on AO3 ~the-brotherhood-rules-okay, the-government-hates-mutants, erik-in-charge, vivisection, captured-raven, charles-is-the-best-mutant, erik-to-the-rescue, charles-to-the-rescue Erik intends to recruit Raven's supposedly amazing, all-powerful older brother. Instead, he finds himself dealing with Charles Xavier, a weak, tweed-addled professor who seems to think powers don't matter nearly as much as personality. Erik's misconceptions are blown apart when Raven goes missing.
Humane Society by smilebackwards on AO3 star, ~human-charles, ~kitten-erik Erik is transformed into a cat. His new owner gives him a new perspective on Humans and is the brother of his second-in-command, Raven. Once Erik finally allows himself to decide that Charles is pretty much the best thing since sliced bread, he spends the next week being incredibly bitter that he's Charles' cat and not his boyfriend.
I heart NY (It's my friends I'm not sure of) by oddegg on AO3 22K ~modern-au, ~depowered, ~single-parent, star Erik is a successful businessman, but a playboy, especially during his meltdown when he was trying to raise twins on his own. Then he meets a professor, who is warned off Erik because of his reputation. This fic is amazingly warm, I love how Charles and Erik's friends conspire to get them together.
In Shadow and Silence by Yahtzee on AO3 13K ~tortured-charles, ~tortured-erik Erik has been blinded by experimentation at Shaw's hands. He's rescued by a mute human who also happens to be a telepath.
In The Punch Line by zamwessell on AO3 29K ~modern-au, ~de-powered Charles needs a date to his tenth high school reunion. Enter Erik Lehnsherr, Raven’s best friend, who happens to be a model and the new face of Calvin Klein.
Into The Fray by miss_aphelion on the kinkmeme (2nd fill) ~alpha-omega-au, hungergames-au In a world where Omegas are very rare and alphas are a dime a dozen, two Alpha tributes are offered up from each district, along with one Omega that is drawn from a pool of all the districts. The Omega is thrown into the arena with none of the training that the Alphas receive and is exempt from being killed, instead serving as part of the prize for the last Alpha standing. Erik and Shaw are Alpha tributes, with Charles being drawn as the Omega tribute.
Iolaus by fengirl on AO3 ~canon, ~filling-in-their-past A look back into Charles's past friendship with a gay man at university. Beautifully written.
Lactation by anon on kinkmeme ~powered, ~alpha-omega-verse Charles has been breastfeeding and his Alpha really wants to get in on the action.
Late Bloomer by so_shhy at kinkmeme and journal epic ~high-school-au, powered Erik is a mutant, the most powerful and beligerant in his high school. He falls in love with the very-human Charles, and comes to terms with the humans around him. Then Charles manifests as the most powerful telepath ever, and everything changes.
Let them talk by manic-intent on AO3 (or alt-ending on kinkmeme) ~dom-sub, powered, sad-charles, evil-erik, logan-to-the-rescue Charles the unwanted Sub. Logan challenges Erik for ownership of his human sub.
Limited Release by rageprufrock on AO3 63K ~modern-au, powered, detective-au Erik is a detective, Alex is in prison. Maybe Alex can help Erik catch Shaw? Amazing talent for portraying Charles's disability realisitically.
Linger by waldorph on Ao3 29K ~the-government-hates-mutants, erik-in-charge, captured-charles, charles-is-the-best-mutant, erik-to-the-rescue, star, the-brotherhood-rules-okay Erik's new house is haunted... by Charles.
Little Birds by winterhill on AO3 35K ~bird-au, star Charles is a little white magician's dove and Erik is a hawk. They try and protect the sparrows from Shaw, the eagle. Totally adorable.
Lost and Found by wallhaditocoming on AO3 - 23K ~depowered Charles dives into the river to rescue Erik's pendant. They discover that they are generals in opposing armies.
Made to be broken by Yahzee on AO3 - 18K ~depowered, modern-au Charles makes a new year's resolution not to date straight men. Then he goes to a party and his friend Erik is there, and Erik feels like experimenting.
Magneto vs The Magical X-men by aesc on AO3 - 11K ~powered, crack Magneto is a huge fan of The Magical X-men and when attending a convention, bumps into another, wheel-chair bound fan.
Make your wars by ppsfaith on AO3 - Series 12K ~depowered, modern-au Erik is an ex-Soldier with serious PSTD. Charles is a psychologist. Amazingly, Erik meets him at a party and doesn't hate him.
Mean world, cold eye by anon on the kinkmeme in 52 parts (epic) ~Ghost-hunter-au Charles is a ghost hunter and Erik is a sceptic reporter sent to do an article on him. But when they meet up at the infamously hanted Shaw House, it's Erik who the ghost takes a fancy to.
Meant for each other (for certain) by a_q on AO3 21K ~alpha-omega-verse, Charles-alpha The night Erik gets a lead that could get him back on Shaw's track, he runs into Charles, gets claimed and tries everything he can to stay on top of things. The night Charles goes out to have a drink, he ends up foiling one kidnap attempt, gets his sister kidnapped, finds his mate and gets courting advice from a demon.
More first than sun, more last than star by Etirabys on AO3 - 11K ~medieval-au, captured-charles, erik-to-the-rescue, minor-powers, star Queen Raven asks her best knight to get her brother back from the Snow Queen. Absolutely wonderful, lyrical story where Erik is really put through the ringer. Beautiful.
Mutant School by ximeria on AO3 - series ~school-au, teachers-au, powered There are two Mutant factions, one lead by Logan, one by Brian Xavier. Erik and Charles are nominated as teachers in a new joint school. Everyone assumes they'll be enemies and hate each other.
Mututally Beneficial Transaction by pookaseraph on AO3 - 41K ~modern-au, depowered, star Erik is a starving undergraduate who finds a website for sugar daddies. He applies and finds himself the "kept man" of Charles Xavier, who is only three years older than him but so damaged from his previous relationship. Slowly Erik learns to love Charles. Absolutely amazing fic.
My Barbaric Darling by on AO3 ~depowered, ~Encino-man-crossover, ~modern-au Erik is a caveman, woken in modern times. Charles is the scientist who has to look after him.
Nation Building and other Diplomatic Negotiations by pookaseraph on A03 - 100K ~genosha-au, ~erik-in-charge With the recent passage of a submissive registration law in the United Kingdom, there are now only two industrialized nation with a relatively stable government to have neither a mutant nor a submissive registration law. Erik Lehnsherr, the newly minted King of Genosha, and his Prime Minister Emma Frost intend to take advantage of this turn of events to bring the Xavier Institute to the island nation of Genosha.
Needles series by skull_bearer on AO3 - 43K ~Erik-Dom, Charles-sub, bonded-au, dom-sub-au, star Shaw destroyed Erik's bond with Charles when he was a child, so they both live their life alone, as outcasts to a Dom/Sub society. Then then meet again, one night in the water. Amazing fic.
Of Kittens and Teacups and Love by literenliteren - 5K ~fluff, modern-au, flatmates, star Charles studies psychology, likes tea and chess and keeps bringing home stray kittens, and Erik lets him because he's maybe perhaps a little bit sort of in love with him. There is a sequel of drabbles here.
Opening Gambit and En Passant by anon on the kinkmeme ~alpha/omega-verse, erik-in-charge, genosha-fic Erik defeats Shaw and claims his omega (Charles) and gets Charles pregnant. Unfortunately Erik is a bit of a bastard and doesn't really get how traumatised Charles is. Angsty heaven.
Ornathologies by tahriel on AO3 - 62K ~angel-au Erik fell because he killed without orders. Charles travels back to Earth to find him, save him. But Erik can't look at Charles's angelic form without being driven mad.
Omega by apokteino on AO3 - 44K ~genosha-au All mutants are sent to Genosha, but Charles's parents hid his mutation. Then one day somebody uses a drug on him during a pro-mutant protest, and he has to flee.
Other crabs cannot be trusted by groovyphilia on AO3 - 8K ~crab-au Erik is a hermit crab, who stalks Ghost-crab Charles
Our House, in the middle of our street by Clocks - 51K ~modern-au, depowered Charles is a social worker, trying to open a home for troubled kids. He meets a German handyman who he employs in his new school - but the handyman has a shady past.
Oysters and Champagne by listerinezero - 3K ~modern-au, ~depowered, ~chef-au Erik is the extremely talented, extremely scary chef at one of the top restaurants in New York, and Charles, the head waiter, is the only person with the balls to stand up to him. Their fights are the stuff of legend, and their argument over the Valentine's Day menu turns into one for the history books.
Phantom Limbs by bagheera_san - 8K ~dark-charles, erik-comes-home Charles has messed with his own brain to deal with his pain. Erik discovers what that is.
Programming by TurtleTotem on AO3 - 12K ~prometheus-au, powered Erik-the-android is very sad when one of the crew dies. This story also has various happy-ending AUs at the end!
Replay by Unforgotten ~time-travel, canon, star After X2, Charles sends his conciousness back in time to 1962 to prevent Erik from becomming Magneto. By sleeping with him! Epic, beautiful story.
Rescue Run by rebooting on AO3 31K ~captured-charles, ~Erik-to-the-rescue The gang at the Mansion have been taken. Each one is given a torture of a special hell of their own. Charles is sense deprived, Beast is dehumanised, Sean wears a scold's bridle, Alex cannot let off energy without killing Darwin.
Rumour has it by blueink3 on FF.net 171K ~canon-au, ~mansion-fic, ~fix-it-fic Nearly six months after Cuba, Charles' life is turned upside down for the second time by discovering that he has a son. Luckily for him, there are a few people out there more than willing to help. Meanwhile, Erik has his own issues with fatherhood to deal with.
Skin deep series by manic_intent on a03 - very long, two complete stories ~werewolf-au, depowered, tortured-eric Charles has hidden himself away for years, ashamed of his werewolf secret. One day, Erik finds him.
Searchlight by redconverse on the kink meme (and the followup Methods of Deduction) ~tortured-charles, tortured-eric AU in the form of a letter written by the head of a mutant experimentation facility who argues against the extermination of two of their test subjects. It's so horrifying because it's so clinical.
Show me your Teeth by tawabids on the kink-meme - Long (epilogue) ~werewolves, erik-to-the-rescue, charles-depowered Erik is a werewolf. Charles is a werewolf hunter.
Sitz by Unforgotten on AO3 5K ~transformation-au Erik is turned into a Doberman dog. Suddenly all he wants to do is please his master, Charles.
Skidding Down the Sliding Scale by keire_ke on AO3 ~modern-au, depowered, cherik-are-parents Alex is Erik's kid. Erik is Satan. Mr Xavier, Charles's teacher, is going to be torn apart, right? Continuation - Alex's dad isn't a monster after all - Regurgitating Refracted Light
Sponge away the writing by Tam_Cranver on AO3, 40K ~fix-it-fic Old, dead Charles comes back in time to haunt young Charles's brain and help him fix everything with the Brotherhood and Erik after the beach divorce.
Stage Left by Sixthlight on AO3 - 59K ~historical-au, powered, crossover-phantom Moira is a singer, Erik is the phantom of the opera.
Start a war by Stewardess on AO3 - 34K ~robot-au, powered, star Mutants have full rights. Cyborgs have none. Featuring genetics expert and telepath Professor Charles Xavier, and Erik, a pleasure model cyborg with a mysterious past.
Stricher by cylin ~modern-au, depowered, prossie Charles lives in Berlin and meets a prosititue on the corner of his street.
Strict Machine by euphorbic on AO3 - 150K ~depowered, modern-au, biker-au When Professor Charles F Xavier accepted a visiting professor position in Arizona, he did so in order to be geographically closer to his sister. What he did not expect to find was the living, breathing specter of the sportbike gang-oriented past he’d been trying to put to rest.
Stupid head by anon on kinkmeme ~depowered, kid-fic Erik and Charles are five. Erik is a mean little kid who bullies the other children in their class, while Charles tries to stand up to him. One day a new kid joins the school who is even meaner than Erik.
Synesthis by starlady on A03 15K ~erik-stayed, mansion-fic, husbands, star We see the family grow around Charles and Erik, although Erik occasionally sneaks off to kill Nazis. This is the one where Erik rescuse child!Kurt.
Taken by His Majesty by Pookaseraph 27K ~Roman-au Erik the Roman Soldier is taken prisoner by Charles the Celtic boy-prince, who turns out to be a brilliant tactician. Loads of real history, great story.
Tea for two teacups by baehj2915 on AO3 - 1.8K ~teacup-au Charles is a sturdy little glass teacup with a glass saucer who lives on the shelf in a tea shop. One day he meets an imposing ornate cup he's never seen before.
Tessellation by nekosmuse on DW Epic (25 parts) ~erik-to-the-rescue, the-brotherhood-rules-okay, capturered-charles, star Charles is a reclusive mutants rights advocate and author, Erik created the Brotherhood, inspired by Charles's work, but they've never met. One day, at a mutant convention, they do. This fic does an incredible job of making Charles's disability real, warts and all. Very, very well written
The Bawd and the John by toestastegood on AO3 39K ~prostitute-au The Manor is an exclusive brothel that has been run by the Xavier family for years. As the leader of the mutant world and a regular patron, Erik has found himself addicted to its delights
The Better Men by turtletotem on AO3 71K ~harry-potter-au Charles is a muggle professor at Hogwarts, the deputy to Shaw's head. Harry is now an Auror. In comes Erik, Charles's childhood sweetheart, to be the new professor. But Erik dumped Charles in their final year as students, ashamed of him being a muggle, and Shaw has plans for muggle kind that rival even Voldemort's.
The Burdens we long to carry by arcapegalo on AO3 66K ~fix-it-fic When Hank develops a metal frame to move the lower half of Charles' body for him if he wants it, Erik offers the use of his mind and his ability in order to make it work. Both find out what they're willing to do for each other, and neither knows if it'll be enough to keep them together.
The Cockblocking High School AU by Etirabys on AO3 6K ~modern-au, school-au, depowered Charles is Erik's roommate. It would be very wrong to fancy him. After all, school comes first.
The Courtship of Francine by Mr Lehmenbot on AO3 97K ~powered, utopain_future_au Set in the future, Erik is forced to marry another mutant by his 30th birthday in order to inherit a fortune,
The Courtship of Henry "Hank" McCoy Xavier Lehnsherr on kinkmeme ~mpreg, ~modern-au, ~powered Alex is dangerous and doesn't deserve to be happy. Especially not with Hank's mad family, including his heavily pregnant "papa" who happens to be the famous Charles Xavier.
The Dog Days aren't over by KaeKae on AO3 - 3K ~dog-au Charles is a good dog. But on the day he saves another dog from drowning, his Mother is very distressed with him.
The Doors They Opened by cfg on fanfiction.net 167K ~captured-charles, ~torture, ~erik-to-the-rescue, moses-au Charles and Erik have never met. Charles is captured and forced to use Cerebro to find other mutants for experimentation. Charles is knowingly tortured as they miscalibrate Cerebro to cause him terrible pain and slowly turn him blind. Erik enters as one of the facilities' bosses, and Charles knows Erik's mind has been tampered with to disable his mutation. This is actually Charles/Moira and incredibly unrelenting and depressing, but I can't stop reading it.
The Funny Thing About Fauns by ysolda on AO3 - series 3K ~kindred-au Charles is a faun who thinks he's made a lucky escape from having to deal with mating cycles and spring fever. Erik, a satyr he meets at a university party, proves him quite wrong.
The Good Boy and The Soldier by tawabids on the kink-meme - Long ~tortured-charles, captured-charles, erik-to-the-rescue After many years as Shaw's protege, Erik hears the voice of God. Only it's not God, but one of the mutants held captive in Shaw's lab.
The Kings Gambit by Shtuff on ff.net - 23K ~fix-it-fic, team-cherik, captured-charles, tortured-charles, erik-to-the-rescue, star Erik doesn't think that Charles should sacrifice himself
The Last Moomintroll by kiere_ke on AO3 - 27K ~moomin-au, powered Erik is Snufkin, Charles is Moomintroll. Adorable and with ART!
The Mystery which binds me still by pocky-slash on AO3 ~powered Charles has repressed the memory of his childhood, and his childhood best friend. Now, returning to Winchester, those memories start returning.
The Pen(is) Mightier by anon on the kink meme ~pwp, power-sex Charles keeps licking and sucking his metal pen. Erik feels everything
The Persistence of Iron by Sylvia on AO3 - 47K ~scientist-au, powered, clone-au Dr Eisenhardt cloned himself just before he died, but the person who awakes has jumbled memories and is sure his name is Erik, sure that something is numb inside him, missing. Dr Charles Xavier tries to figure out what's gone wrong. Amazing, complex distopian mystery.
The red cloak by pandabomb on AO3 - 3K ~alpha-omega -au, werewolf-au Charles walks through the woods, only to be attacked and claimed by an animalistic alpha.
The secret of dragon ranch by winterhill on AO3 - 23K each ~my-little-pony-au, actors-au Two stories - the first is a My Little Pony episode. The second is about the actors, Charles and Erik, that voice the episode. Wonderful, wonderful mad fluff.
The Tale of X by thehoyden on AO3 - 3K ~japanese-myth-au, powered Charles is worried that he's been possessed by a kitsune spirit, until he meets Erik the tengu - a winged Japanese spirit.
The Welfare of a child by oddegg 2K ~de-aged, powered Charles is deaged to a baby then slowly grows back up again. But Charles doesn't need much looking after. When he's a baby, he never cries. When he's a little kid, he's really self-sufficient. Everyone's charmed/amused by this except one person (Sean) who is really unnerved by this. All babies cry. Kids that age are not that independent - they're just not. Unless they're used to nothing happening when they cry/used to fending for themselves.
The Winter of Banked Fires by Yahtzee on AO3 - 67K ~x-men-3, charles-back-from-the-dead, captured-charles, erik-to-the-rescue ~star A truly epic fic that deals with Charles coming back from the dead at the end of X-men 3 and continues the story is the most wondeful, warm, delightful way I've ever seen, really delving into the impact of "The Cure". Features Logan/Rogue and Charles/Erik as primary pairings, as well as most people, including Logan, getting Cured at one point or another. Amazing.
This Harbour (that we call home) by nekosmuse on AO3 - 73K ~crane-wife-au, powered Erik is a solitary fisherman who lives alone on the outskirts of a tiny village in Norway. One day he finds an injured crane and takes it into his house to help it heal.
This is not comedy by baehj2915 on AO3 - 17K ~comedian-au, standup-au, modern-au, powered Erik is a struggling comedian who falls for a major film star, and does a stand-up set about it which goes viral.
Took me by surprise and then by thehoyden on AO3 5K ~fix-it-fic, powered After his second surgery, Charles is taken in by Tony Stark and The Avengers to recover. He lends Erik the use of the mansion at Westchester. But all Erik wants is to know where Charles has gone.
Try a little tenderness by Anon and others such as alishatorn on kinkmeme ~sub-Charles, dom-Erik, dom-Logan, neglected-Charles, star Erik is disgusted when the very human Charles is imprinted as his Sub, and neglects him shamefully. - imprinting by poor_medea -- Erik rejects Charles on imprint, but this one is a little happier.
Us by Pangea on AO3 73K ~onslaught-au, canon-au, dark-charles, capturered-charles, erik-to-the-rescue Shaw captures Charles and breaks his mind, making him think like him. When Erik rescues him, the only way they can function is for Erik to be Charles's conciences.
We Welcome our New Sexbot Overlords by professor on AO3 - series ~robot-Erik, depowered Robot-Erik frees all the Robots and takes over the world to win the love of his human owner.
We Were the Only Ones There by pocky-slash on AO3 ~powered, modern-au, summer-camp-au As if Erik's summer wasn't bad enough as it was, one misstep on a trail has found him trapped in a cave, fending off a panic-attack, with only one of the brats from the camp across the lake for company.
What Happens Next is up to you by Winterhill on AO3 - 5K ~omelas-au Raven is one who walked away from Omelas. While walking, she runs into the boy who saw kindness and the boy who questioned. But who is who? The best Omelas AU I've ever read.
What You've Really Been Chasing by helens78 on A03 - 8K ~charles-sub, erik-dom Charles goes out looking for rought sex. Erik wishes he would just stay home
When We Two Parted by nekosmuse on Dreamwidth ~timetravel-au Erik asks Bishop to send him back in time for only 41 minutes, to a critical time when one change might mean a lifetime's hurt rubbed out.
When Myths Meet Mutants by Ember on AO3 - 18K ~narnia-crossover, powered, mansion-fic Charles finds a mutant who looks very much like a mythalogical Faun. When Tumnus meets another new arrival named Michalos, all hell breaks loose.
White Noise by Tawabids on AO3 - 15K ~powered, ~genosha, erik-in-charge Beautiful, complex, and ultimately sad story, written like a series of found transcripts. Charles is a mutant activist, captured and forced into a Schehrezard-style story-telling bargin for his life. Erik thinks Charles is his Omega, but is he really?
Worked to exhaustion by ooktavia on the kinkmeme - 39 parts ~non-powered, modern-au The first time Erik Lensherr, CEO of Eisenhardt Enterprises, met Charles Xavier he might just have called him a homeless drop out and accused him of being a junkie, before realising he was a waiter. He almost apologised.
WIPS
Alea iacta est by anon on the kinkmeme ~charles-Omega, erik-Alpha, erik-underage. highschool-au Erik is a schoolboy. One day he imprints on a much older Omega. Then everything in his life goes to hell. Abandoned at part 16 in Feb 2012
Alien Ressurecton by acrazedartist on kinkmeme ~alien-au Erik is an alien hybrid who refuses to mate and reproduce. Charles is a scientist who Erik takes a fancy too. Abandoned at part 10 in July 2012
And they say romance is dead by anon on the kinkmeme ~alpha-omega-au, charles-omega Erik rapes Charles at a party and is then when Charles becomes pregnant, is forced to marry him. Abandonded at part 46 in March 2012
Armour in the time of Armed Robbery by Dangereus on AO3 9K ~robbery-au Erik stalks Bank Manager Charles. Then one day Charles's bank is robbed and Erik finds himself in the middle of it. Abandoned at part 4
Bad Romance by InventingWords on AO3 17K (to part 6) ~wip, modern-au, depowered, rockstar-au Erik is €rik, Charles is a music journalist Abandoned at part 6
Bookshops and werewolves by aesc on kinkmeme ~werewolf-au Nottinghill stype AU where Charles is a film star and Erik owns an occult bookshop and is secretly a werewolf Abandonded at part 10 June 2012
By the edge of your blade by fourfreedoms on AO3 ~courtesan-au, powered Charles is the most rubbish courtesan of his house, so he gets sold on as a spy instead. Abandoned at part 7 in August 2012
Carpe Brewski by gyzym - multichaptered epic ~WIP, depowered, modern-au, unrequited-charles, university-au, star Erik is president of Alpha Beta Gamma, Charles is his best friend, who is secretly in love with him. Abandoned at Chapter 10 - fanfiction After the storm by celli-inblots on A03
City by the sea by Black_Betty on AO3 ~powered, arranged-marriage-au Erik is a reclusive Prince and heir to the throne. Charles is promised to marry him, and hopes that Erik will like him. But Erik hates Charles people and it makes Charles sad. Very sweet story. Abandoned at Part 15 in September 2012
Do Not Run In Hallways by Anon on the kinkmeme ~WIP, modern-au, alpha-omega verse Charles is much too young to be imprinted by his Alpha teacher at school. But that's what happens, and Charles has to keep Erik at a safe distance, while Erik stalks him, watching his house and pines. Abandoned at part 56/Future Interlude 2 There is a second fill called "A case study in disparate Alpha/Omega dynamics", also abandoned at 5d
Everyone has a price by sugaranon on AO3 47K ~WIP, depowered, erik-in-charge Charles is a student and Erik is his sugar daddy. Moira doesn't approve. Abandoned at part 15 due to lack of warnings on the kinkmeme
For the best by LustMonster on AO3 - 13K ~mad-Charles, Erik-to-the-rescue Charles has been institutionalised all his life. Erik busts him out and tries to make the best use of him. Abandoned at part 6
Hands of Blue by pinkninjapj - Multichaptered ~wip, tortured-charles, erik-to-the-rescue, mansion-fic, au-meeting When Erik raids The Network, he finds a man in an iron mask. It's been welded on Abandoned at part 4
Headlong Toward the Starry Sea by garnettrees ~prometheus-au Having recently lost his wife, renowned geneticist Brian Xavier signs a five-year mission contract with Weyland Industries-- and brings along his brilliant fourteen year-old son, Charles. The Nephthys is a deep space research vessel, complete with cryo facilities and a David 8 model Ship's Assistant. Abandoned at part 5 in Oct 2012
Home is where the heart is on kinkmeme ~powered, kiddy-fic Charles is seriously abused little abused kid who is adopted by Erik's mother. For some reason, he takes a shine to the teenage Erik Abandoned at part 8d
I swear it's the price of love by Helens78 on AO3 ~brothel-au Charles runs a house for companions and Erik is a new client. It's quite clear that Erik wants Charles but is repulsed by his telephathy. Therefore Charles holds him at arms length and sets him up with other people. Abandonded at part 13
Island Island by LittleBlackDog on AO3 39K ~WIP, modern-au Charles is washed up outside Erik's cabin on a small Island, and has no memory. Erik looks after him until Charles is able to return to the mainland. Beautifully written - shame it was abandoned. Abandoned at Chapter 30
Made for each other by a_q on the kinkmeme ~alpha-omega-verse, charles-in-charge Charles always thought he was an omega, until he meets Erik and realizes he's Erik's Alpha. Great take on A/O verse. Abandoned at Chapter 22
Masters of the Universe by NezumiPi on AO3 25K ~teenage-au, powered Erik is a disturbed 12 year old boy, who hears voices in his head. He also thinks he's a master of the universe. Abandoned at Chapter 18 in February 2012
Mr Xavier's Neighbourhood by SharpestScalpel on A03 ~modern-au, powered Charles has a children's TV show, Erik's twins love it. A sweet series of stories, abandoned atAn Afternoon at the Bandshell part 7 (31st December 2012)
Mythical creatures by gildatheplant on the kinkmeme ~baby-faun-charles, baby-stayr-erik Erik announces proudly to his parents that he's found the perfect little faun and he's going to carry him off. Charles's mum suggests that Erik lets her little boy get a good night sleep first. Most adorable thing ever. Abandoned at part 4d in March 2012
Nine Eleven Ten by Subtitlor on A03 - 338K ~epic, powered, alternative-timeline, captured-charles, tortured-charles, erik-in-charge In a distopian future, the Queen of England has a deal to send all mutants to the Brotherhood territory on the East Coast of America. Charles's powers are discovered and his is shipped off to a remote mansion and training center to be phychologically tortured into submission by the White Queen. However, nobody could have predicted that the White Queen's most violent and trusted ally, Erik the Red, would become so fascinated with their new addition. Slow WIP at part 35 in April 2012
Omega (untitled fill) by anon ~wip, ~dom-erik, sub-charles, star Charles has resisted being mated for years, but his Omega instincts go wild when he meets Erik (an Alpha) and goes into heat. Such a shame this was abandonded, but what's there is amazing. Abandoned at Chapter 31 (15 Dec 2012)
Our House by Clocks on AO3 42K ~wip, modern-au, powered Erik is Charles's handyman with a dark secret, but becomes much more to Charles and to his students. When Shaw finds out, Erik is driven away. Abandoned at part 10
Paper Monsters by clocks on AO3 22K ~wip, modern-au, depowered Erik is a writer and Charles is his biggest fan. Erik knows this. Charles doesn't. WIP at part 10 (last updated Feb 2012)
Pertubation Theory by Sylvia on AO3 ~Alpha-omega-verse, Charles-Omega Fascinating take on Charles being an Omega, where Omegas have all the power and Alphas are seen as too emotionally unstable to hold down a research job in a university. Erik is an alpha was was raped by a pack of Omegas in his youth. Abandoned at part 7 in April 2012
Say you're mine by Dangereus on AO3 12K ~alpha-omega-au, charles-alpha, erik-underage, student-teacher-au Teacher Charles imprints on Schoolboy Erik and Erik thinks he's creepy. Abandoned at part 8 (30 Jan 2012)
Scenes from a marriage by anon on kinkmeme ~Alpha-Erik, Omega-Charles Charles is married to Erik in a world where religion is mixed up with alpha/omega politics. Charles has no idea what's going on, only that he's in heat and wants to be mated. Erik is horrified that he's no more than a child. Abandoned at part 13 (last updated Feb 2012)
Soldier Alpha/Omega by anon on kinkmeme ~Alpha-Erik, Omega-Charles Erik is passed bonding age and bitter and in the military. On the eve of his going back for a year long tour of duty, he meets his true omega in the bar. The bond is instant. Abandoned at part 11 (last updated May 2012)
The Affairs of Dragons by Takmarierah on AO3 63K ~powered, dragon-au Erik is a powerful dragon, one of the last of his kind. Charles has no idea that his next-door neighbour is a dragon. Abandoned at part 11 (August 2012)
The Awakening by ferretbaby on AO3 40K ~alpha-omega-verse, mpreg Charles is the prophesised mother of the saviour of mutantkind. However, Erik has to breed him. Abandoned at part 12 in February 2012
The Starry Sky and the Deep Sea by Spicedpiano on AO3 - 32K ~space-opera Once a star, Charles is forced into a human form following a crime of treason, cursed and exiled into a mortal life. Rescued by a crew of mutants led by Commander Erik Lehnsherr, he soon realizes that the voyage they are on is doomed. Abandoned at part 10 in Dec 2012
Unbound by helena78 and others on AO3 139K ~wip, modern-au, powered, soulbonding, dom/sub, forcebonding Unbound is the middle of three stories in the series and will wrench you through the biggest angst-forest there ever was. Charles and Erik are soulbound but too young to find each other in person yet. They can feel emotions and sometimes thoughts. Erik's foster parents assume he's sick and take him to see Bond Therapist Dr Shaw. Horribleness ensues. Note, story three in this series is complete and is a fluffy version of the same premis, where Charles and Erik do meet at 14. Work in progress at Determined - Part 5, 27 August 2012 Also see Homeward Bound - a happier AU
Utopia by takmarierah on the kink meme ~wip, erik-in-charge, the-brotherhood-rules-okay, captured-charles, star After establishing himself as the ruler of the world, Erik brings Charles to his new home/palace and informs him very politely that he, Charles Xavier, is to be his new consort. Charles is less than pleased. Incredible, detailed, sumptuous distopian AU, rich with backstory and detail. And I'm not just saying that because I'm beta-ing it. WIP to part 21 11 Feb 2012
What doesn't kill you by honour_huston on AO3 ~modern-au, depowered Charles and Erik were married, then they are in a terrible car accident and Charles loses all his memories of his life with Erik. Distrustful and hurt, Charles has no wish to pick up his life where he left off, and his mother is quick to take advantage of this. Erik is heartbroken. Abandoned at part 12 in September 2012
When No in Genosha means Yes by anon on kink meme ~powered, erik-in-charge, charles-in-hiding, dom/sub-pairings Raven is summoned to court in Genosha, to see if she's Erik's sub. She's not. However, her human (secretly mutant), dom (secretly sub) brother secretly is. There's a second prompt on this thread. This story goes up to 43 chapters before being abandoned but is pretty complete. There is a great second fill to this called Hidden in Plain Sight, also abandoned at part 10c
You've got to lose that inhibition by anon on kinkmeme ~charles-sub, erik-com, WIP Charles resists, but it's Erik that finally gets him to go down into subspace Abandoned at part 18C
You open always petal by petal myself by etirabys on kinkmeme ~erik-sub, powered, WIP Erik is purchased by Charles as his secretary, and has unstable powers. Abandoned at part 56
Bonus - McFassy Fic
A cure through love by stewardess 7K ~adangerousmethd-au, thelaststation-au Valentin Bulgakov, Tolstoy's personal secretary, suffers from hysterical sneezing fits. Tolstoy sends Valentin to Zurich to be cured by the famed psychoanalyst Carl Jung. Jung is soon passionately involved in the case of his new patient.
Imperfection by sterwardess on AO3 - 9K ~prometheus-au David 8 and David 9 journey to the arctic and bond. Abandoned at part 4 May 2012