Well the plain cutting board has nothing to allow the armour from slipping away, like the tight fit ones.Just when I thought the armour for the ginormous breasted ones was a tight fit. It was actually the cutting board getting a nip slip.
I think a lot of people kinda expected him to have that kink since chapter 10, when Whip-sensei with her strong S&M vibe first made an appearance.Dude's got a degredation kink. Who knew?