"Okay..." Jess sighs in defeat, turning around and allowing Bill to mount and insert.
"There - grrnt - there ya go, Jess..." He grunts, thrusting with even more vigor than he had with Mary.
"But Bill... ooh... ooh... *squee!* Bill, if you're in here with us, who's going to feed us?"
"Quit flappin' yer gums. Yer ruinin' the experience. Take it like a pig and squeal!"
And thus she does, squealing in orgasm as he pumps her furiously.