HELLOOO HAHAH ty for the ask!!
this is a nsfw wip of mine centered on bruce and clark discovering clark is an omega when he goes into heat for the first time.
some background knowledge: bruce and clark are just friends at the start, and humans don't have secondary genders. clark had no idea kryptonians had secondary genders because after his parents' message was translated (going with superman 2025 canon), he was hesitant to learn more about what being kryptonian used to mean.
but he goes into heat in the fortress, and all he knows is that he's miserable and he can't do this alone. he sends a distress signal to bruce, along with a message begging him to come to the fortress as quickly as he can.
bruce arrives to see clark half undressed and flushed an unhealthy red, and he has absolutely no idea what's going on. he sets clark up in the bedroom and starts on gleaning as much info from the fortress as he canβwhich proves to be incredibly difficult when clark gets desperate enough to present himself to bruce, and then it's just a test of willpower for bruce because since when did clark have a cunt?
eventually he manages to understand that clark is in heat and the best way to help him is through sex. then they fuck nasty because of course. clark is super embarrassed after the fact but bruce is dead set on making sure he's the only one who'll be helping clark out with his heats from now on.