"Stroking the penis."

"Stroking the penis," Mrs. Cleft announces the purpose of the next exercise.

"Tommy, I want you to trade places with Joy," Mrs. Cleft instructs.

"Mom," Tommy gripes as he stands up, "I don't know about this..."

"Do you want to quit the exercise?" Mrs. Cleft

Before you sit down you lean in to Tommy's face and whisper, "I'll jack it good."

"N-no," he stammers, his eyes on your bare breasts as you sit down in front of him.

"Now," Mrs. Cleft wets her lips, "Tommy, I want you to pull down your pants and underwear so that Joy can see your penis."

He slowly and uncertainly unbuttons his jeans and unzips his fly. He pulls his pants down to reveal a pair of tight white briefs that are doing little to hide his huge erection. When he skins those down his legs as well one of the biggest cocks you have ever seen bounces free. It's at least nine inches, maybe more, and it's rock hard.

"Wow," you exclaim.

"It is very large, Tommy," Mrs. Cleft adjusts her glasses. "I had no idea."

You reach out and take hold of the warm shaft without waiting to be told. His heavy balls hang low beneath his big prick as you begin to gently stroke from the base all the way to the swollen head and back down again.

"I see you have done this before, Joy," Mrs. Cleft observes. "This lesson will be for Tommy's benefit then."

"Yes, Mrs. Cleft," you say, watching your hand work up and down her son's big cock.

"Ohhhh," Tommy moans.

"Tommy," says Mrs. Cleft, "I absolutely do not want you to orgasm from this. Joy will stroke you for a few minutes and then we will move on to another exercise. If you feel that you are going to orgasm then warn Joy and we will stop. Do you understand?"

"Mmmmm," is all he can manage as your fist pumps his prick.

"Do you understand!?" Mrs. Cleft snaps.

"Yes, mom," Tommy replies.

You work his prick like a pro, spitting on his shaft to lubricate your stroking and adding a twist to your downward strokes to heighten his pleasure. You use your other hand to gently massage his balls, stroking and lightly squeezing them as you jerk his dick. Clear precum begins to ooze from the hole at the swollen tip of his cock. You sweep your thumb over the juice and spread it down his shaft. It works even better than your spit to turn a rough jerk into a slippery smooth handjob.

After a few minutes you feel Tommy's balls begin to tighten up in your hands. He begins to work his hips and thrust his enormous cock in and out of her clenched fist. His sliding prick makes wet slapping sounds as he pounds it in and out of your grip.

You look up at Tommy. His eyes are half closed and he has a dreamy smile on his face. You wonder if he's aware enough to warn you if he's about to cum.