Sherlock and John sperm donors: Spencer Reid's real parents

[vnovice.livejournal.com]

So I'm looking for a Criminal Minds crossover fic I read somewhere. Long before they met John and Sherlock donated sperm for an experiment that would make babies from two men. Spencer Reid finds out that he was one of those babies and wants to meet his biological dads. It just so happens that John and Sherlock are flatmates now. If anyone can help me out I'd appreciate it.