This does happen in canon!

Mili and Trapper have a one night stand because she couldn't control herself and hadn't been laid in almost a year, thank-you-very-much.

Jay and Trapper are friends with benefits.

Jay has a minor crush on Mili and pokes her about it relentlessly.

So instead of writing the story, I drew the comic to relax after my first day in class, as;kaslfkd

Mili and Jay (and the mentioned Trapper) belong to moi, as does the art.