- Post CA:TWS!Bucky doesn't get hard because of all the trauma and Steve sucks on his flacid penis. There's a lot of H/C involved.
- Post-Serum!Steve gives Post!CA:TWS!Bucky a boob job.
- CA:TFA!AU. There is no serum. Bucky goes to war, Steve works for Howard Stark. Bucky returns and they live together.
(There are many fics following this theme, but the one I'm looking has a final scene where someone is interviewing old!Steve and old!Bucky when Tony Stark crashes the interview. He is their godson and they have been raising him since Howard and Maria's death)