"So," she says, laying back and spreading her legs, "this weekend I want to use my pussy to make you my own... You're going to put your cock in my pussy, and then we'll keep it there all weekend..."
He nods, thinking he will be fucking her all weekend.
"Good boy..." she teases, "the only catch is you won't be able to thrust or move around! And I won't let you cum the whole time... Is that OK?"