She loses the panties, but a mishap ensues

As if it had been aimed right for it Rachel found Billy's cock kept rubbing against her clit, and although she'd been trying to stay professional she found herself enjoying it, giving it extra hard rubs.

"Panties," Billy gasped.

Rachel smiled coyly, brushing her hands down her breasts, then the sides of her taut stomach before grasping the thin straps of her panties. She taunted him with another rotation of her hips, locking her eyes on his as she stepped off of him and peeled the panties down. As they passed her hips she released them, letting gravity do the rest as she wiggled them off, kicking them to one of the boys.

Turning back to Billy she smiled again as she saw his eyes staring at her pussy. Her hand went back down to the thin 'landing strip' that pointed the way, her fingers spreading to either side of her sex until they felt the rings in her lips and clit. She gyrated her hips, and lowered herself slowl until she was grinding against the fabric of Billy's boxers.

She blinked, wondering when he'd undone his jeans, but the shock of feeling his cock so much clearer, and seemingly so much larger and harder made her forget herself and she found herself rubbing forcefully against the knob like she was trying to impale herself.

"Oh God that's so good!" Billy gasped, arching as he came closer to orgasm.

Rachel's grinding and his humping brought them both closer to orgasm, until without warning her pussy rings caught the edge of his boxer's fly and pulled it wide open. His cock popped out eagerly and without realizing pussy and cock rubbed against each other with nothing between them.

Neither of them noticed at first, until...