I didn't like that hesitation there, but at least you gave the right answer.
Before I untie you, I'm going to rub your cock down with ice and lock it in a chastity cage. You won't be able to get an erection, so you won't be able to cheat on me again. From now on, you don't get to touch your cock and neither will anyone else, just me. And believe me when I tell you that If I unlock that cage, your hands will be firmly secured away from it.
I still haven't decided yet if you'll get to cum before I do that though, so pay very close attention to my next couple of questions.