Numb3rs Fanfic Finders

I'm searching for a fic I loved and am dying to re-read, but I can't remember who wrote it, or where I found or...or even what it's called. I just remember a scene where Charlie and Colby have just had sex (I think it's Charlie's first time 'catching') and Charlie's brains have just been sexed right out of his head. Charlie babbles something to Colby, who responds "prostate orgasm'. I think it was a part of a series. Can anybody help me?

TIA

Edit: OOPS, it just occurred to me that I might have the 'positions' reversed, it might be Colby who just had his brains sexed-out with the prostate orgasm...but for some reason I still think it's Charlie...stupid faulty memory. Stupid me forgetting to bookmark!