When I put My slave behind his wall, I make him locate his cock (sometimes his balls too) then attach the three straps (located on their Lower Back, Ass & Upper Thighs), As I pull these tight it forces him extremely tight against the wall and totally locks him in position so he can not pull his cock back through the hole !! I also lock his wrists above his head. 

He must just WAIT to feel what is going to happen !!

Will I Tease or Torture it !!