Desperate-filthy-wrong, and SO well executed, Mystery Author! This is absolutely brilliant. Sirius' justifications are marvelous, and the moments when they almost slip even more so. Being able to see bits of Harry's POV works so incredibly well; it allows us to see just how out of it he is, and how much he trusts Sirius, and how very dubious the consent is. Sirius' realization of what he's just done is wrenching.