This is so so good! Sirius is just beautiful here -- character-wise as well as physically -- and OMG James! That whole "we're even" thing. Lily was right, he's a disgusting toe-rag. WHAT happened that she married him? Must have been sheer persistence on James' part. You're really grooving on the bittersweet in this whole story, and this installment is really a stellar example; if Remus can't have what he really wants, he falls back on what's familiar. And I actually feel a bit sorry for Sirius that he's doomed to be second best.
I'm so glad you decided to do LMOM, b/c I'm enjoying the hell out of this story.