Excuses, excuses, he never blackmailed you to have sex with him, he specifically said he'd be OK with coming in your hand. You know very well you wanted it yourself by that time.
Well...I suppose at least he's decent enough to keep her to himself rather than doing it in public and asking those other guys to join in, or something.
I mean he's still a blackmailing her, but who knows. Maybe she'll even come to like it, as do most girls in these kinds of stories.