Pry your sub's mouth open and see what you can fit inside!
Shut your sub up with a gag that keeps him from talking back but still allows you to hear every nasty sound he makes. Secure this Jennings gag to your sub's head and behind his teeth. Start out with it closed as you do whatever you want to his body and he moans in pleasure. When you want to give him more of a challenge, crank that slutty mouth open a bit more. When you're satisfied that it's as far open as he can go, see if you can shove your cock inside! Never again will you have to tell him to ""open wide!"" Now you can make him!