Stop! Take your hands off. I need your cock hard and I don't want there to be any accidents. Take two minutes to cool down. Just stare at this body and tell me how lucky you are.
Calmer? Good, I expect to cum several times before you do, so don't disappoint me. In fact, it might help if I show you how I like it.
Spit on your palm a couple more times, my pussy's really wet. Now, stand up and make a tight fist in front of your dick. Slowly push into it, using your hips, not your hand. Keep that fist tight and go all the way down. Good, now pull out until you're just gripping your head. Now slowly back in.
Oh yeah, that's just how I like it: slow, steady rhythm. Keep going.