Fic: You've Got A Friend In Me
; fill at avengerkink
Prompt: Bruce/Tony-Unknown Internet Pals; Picturing a fic where sometime in the past (long before Iron Man and the Hulk came along) Bruce and Tony were anonymous internet pals on some kind of chatroom, exchanging brilliant sciency stuff, inspiring each other, becoming best friends, all without realizing who the other really was. They poured their hearts out to each other, telling their darkest secrets, and falling a bit in love. And they one day, one of them stopped answering.
Years later, Tony and Bruce meet in real life, and hit it off instantly. Somehow, eventually, they discover who they really are to each other. Bonus points if they knew each other by on-screen names, and that's somehow how they discover each others identity. Extra bonus points if they'd resumed chatting, and were talking to each other about the other(no names of course, because the avengers is top secret) without realizing it)