MFM and FMF here.
The FMF was at a friend's house on poker night. After a few drinks it became "strip poker night" and things proceeded from there.
For the MFM, chalk up a score for college. No bi-curious stuff or anything, just a good time upstairs at a frat house. I wasn't her boyfriend, and neither was the other guy. Naturally, upon finding out that we just tag-teamed the
little sister of one of the ranking brothers in that chapter, we ran like hell.