breastbondage.tumblr.com/post/24459003638/
looks like this was going on a good while ago. Maybe even pre-digital.
breastbondage.tumblr.com/post/24459481377/
breastbondage.tumblr.com/post/24459528319/
breastbondage.tumblr.com/post/24459543962/
breastbondage.tumblr.com/post/24459612196/