You can feel your huge erection growing as he assumes the position. You had planned on just playing with him a bit, but this sight was just too tempting. You rub up your shaft with as much spit as you can quickly. You approach Johnny from behind and grab his cheeks as you slide in fast and unexpected, then move your hands to cover his mouth and push him to the floor on his hands and knees. "Uhhhhh, hell yeah" you whimper as you passionately kiss his neck, giving him a hickie, and thrust into his quivering bottom a couple of times real hard, as he struggles beneath. You are only about halfway in, but loving it. He tries to stand or bump you off, but the more he struggles, the harder you tighten your grip, slamming him into the floor. After a few minutes, he actually starts moaning as if he's starting to like it. At that point, you lose it, filling him with your lovejuices. You now realize, that you can't just let go of him, or get up without incident. But, what do you do?