Prolapse on LetMeJizz
Hard anal and deep toy work loosen everything first, then the performer bears down until pink rectal tissue pushes out past the rim. The scenes treat that moment as the whole payoff, holding the close-up on the rosebud as it gets coaxed out and tucked back.
247 prolapse videos here, all HD and all free. New ones go up daily, so check back if you don't find your scene first time around.