Her pussy.

She straddles your body and loweres herself to a crouch dipping her pussy down to meet your shaft, feet still flat on the floor she guides your cock into her pussy with her hand. Taking you all the way in she begins bouncing on you like some sort of fuck doll. Getting into the action you arch your back and rise to meet her thrusts with your own, the slaping of her ass and you are nearly as loud as you realize both of you are grunting and screaming as she rides you like a stallion. Then she opts for a change of pace and grabs you by the hair and pulls you to a seated position and lets her legs go falling onto you, impailing herself on your rod. This proves to be to much and with a few more grunting thrusts you feel her begin to ooze, her face contorted in extacy you blow your load into her. Standing back off of you, her cunt dripping your mix of juices she sticks her finger in her cunt and licks it. "MMMMM good."