Once he agrees, make a ring with the thumb and forefinger of one hand and hold it at the base while the other hand gives him a firm stroke all the way up and down his shaft, including the head. This grip could make him cum very quickly, so go slow at first and pay very close attention to his responses. If his muscles tense and his breathing changes, slow down and lighten your grip, but don’t stop stroking him until he tells you that he’s about ready to cum. When he does, release your grip entirely and listen for his groan.
Say: “Oh, that was close, wasn’t it? You were such a good boy to tell me when you were about to cum so that I could stop. We want to keep your pleasure going a little longer, don’t we? I know you think you can’t wait any longer, but the reward is going to be so great that you’ll be glad you held out. I know what’s best for you, and I think I’m going to edge you again.”