The lad was bound and ready to serve @britunilad. Now he just had to wait for him to return from work. Waiting all day unable to play with his hard cock just made him hornier
I’ve kept lads in lockable mitts before, and it doesn’t do jack; they can still thrust away and shoot without permission.
Lock the mitts to the collar, and you’re fine; they either can’t lift their cock up that high, or they learn to be pretty flexible - which is a win as well ;)