Fuck her face!

As she slowly bobs up and down on your rod, you have the primal urge to just shove it all in. After a while, you can't control it, so you grab her head, and start to push it in and pull it out on your cock. You can feel her struggle, and gag, but you have no relent. her face is getting really flushed, and her throat closing around your cock causes you to explode, but where?