Mmm, is that nice and frustrating?
I want you to tap your cock for me 15 times. Then you can cool off for a bit.
Whilst your cooling off I want you to practice some exercises to tighten up that butt of yours.
Stand on your tippy toes and squeeze those butt muscles as hard as you can. Come down and relax. Then go back up and squeeze again. Do this 15 times.