She is probably going to sprint naked and he probably nut while running it he is also made to sprint naked and the dude that saw him nut is going to see him nut again
LMAO ... what a strange ultimatum. I mean if he wants some pussy I'm sure the boob-sensei would give it up. But I guess he feels it's gotta be sister-in-law or bust (a nut). Either way he's gonna nut but will it be on his terms ... tune in next time for 'Should I rub one out or will you do it for me'.