They Come In Threes is the most cracked out and fabulous crossover I think I've ever read. American Idol RPF (Adam/Kris, of course) and Merlin. Yes, BBC Merlin, yes, that Merlin, and a genie in a bottle reference and bewildered Adam and persistent Kris and supercilious dragon and...oh, guys, just go read it. So much fun.

Rated M, for those who need to know about appropriateness.