Polyamorous Marauders (Sirius Black, James Potter, and Remus Lupin). You won't automatically start in a relationship unless that's what you're looking for.

This isn't the newer version of Sirius that I've seen, I'm trying to stick to canon personality, behavior, and descriptions as much as possible, with a few things implied that are head canons for me.

This is a WIP for now since I'm just getting started.