With you on top...

Making Mr Williams sit in his chair, you straddle him and are just about to lower yourself downwards when he stops you.

"Joy, I haven't got any condoms, what if you get pregnant?"

You growl as you sit on his throbbing cock. "I'm on the pill."

With one thud, you are fully impaled onto your former teachers cock, both of you groan from the stimulation.