"Oh, Donald, look at your stiff prick," Vivian said breathlessly. "I guess you got awfully horny from licking my pussy, didn't you, baby? Now your cock's just as hard as a rock."

Donald gulped and nodded his head. Vivian patted the cushion beside her on the couch.

"Hop up here, Son. I know this is so wrong of me, but, well, I suppose I just have to give you some kind of relief. You'll never be able to get to sleep with a boner like that throbbing all night, now, will you?"

Donald sat on the couch beside his mom.

His cock had turned the front of his pajama bottoms into a tent. Her fingers shaking, Vivian grasped the elastic waistband and slid it down her son's hips. Donald lifted his ass to help her remove the bottoms.

Then he was naked. At long last, Vivian had an unobstructed view of his stiff prick. Donald's cock was incredibly large for a teenager. At least eight inches, thick and fat, pulsing in a rigid column over his stomach.

His balls were big and bloated with jism, surrounded by a thick growth of hair. The cum tube seaming the underside of his prick shaft was even more swollen with spunk. Vivian moaned as she studied the fat, flared cock knob, seeing how big and puffy it looked, how fresh cock sap was oozing from the little slit in the tip.

"What a beautiful prick," she whispered softly, gliding her fingers down the straining cock shaft. "Good God, Donald. Are all the boys in your high school this well hung?"

Donald shook his head, smiling proudly. Vivian wrapped her fingers tightly around the root of his cock. His mammoth prick was so thick that she could barely grip it all with her fist. But she managed, beginning a slow, hard, pumping rhythms on his rigid prick shaft.