O-ring Domination
During butt sex, right before cumming, he slaps her neck. She freezes and clamps down so hard, the o ring pops out and he slices it off and wears it like jewelry.
He hit her in the neck and then sliced off the o ring. I nearly fainted.
He punched her in the neck and then took the o ring as a souvenir. Classic.
He slapped her neck and then took the o ring like it was a piece of cake.