Solve For The Variable, Xxx

Description: She helps him out by making him feel a little more comfortable while he masturbates on the couch. She plays with her twat and watches him stroke his huge ruler. Then he adds his dick to her twat, and the crazy sexy times grow exponentially. He sticks his big inequality into her and works through all the calculations with ease. She loves every inch and ride him up and down, showing him all the possible values that a variable can have. Finally, she takes his derivative on her chin and is totally satisfied. This seems like how math should always be taught, doesnt it?