Extensively

Mike's leaky dick gushed precum as he stroked his bloated tip and kneaded his full balls. He glided his palm over his cock slit as he jerked, scooping up precum and coating his shaft with it. Mike eagerly stroked himself, carefully rubbing the precum into all surfaces of his thick cock. He watched as the cum absorbed into his skin and friction quickly returned to his drying pole. Shortly thereafter, a curious sensation welled up within the base of Mike's cock. He felt a fiery heat within as his dick steadily began to swell.

Mike thrust his head back against the bed as intense pleasure took hold. He felt his cells dividing, multiplying and expanding - the sensation was incredible and definitely distinct from using the Master PC. He could only compare it to a never-ending erection that kept re-doubling just as he expected it to reach full potential. The growth finally slowed just before Mike was overwhelmed by ecstacy. He admired his newly swollen member, which now reached a few inches higher toward the ceiling.

Mike was snapped out of his stupor by Melissa moaning. She was lustfully gazing in his direction and watching his tool grow, leaning against the bathroom sink for support. Her now comparitively smaller cock stood at full mast and pulsed with need. Melissa was clearly trying to resist touching it, hands desperately gripping the sink behind her.

Realizing Mike's discovery of her voyeurism, Melissa stood up straight and strode over to the foot of the bed. As she stepped next to his legs, Mike glimpsed the faint outline of her plump, unaltered butt through her towel in the closet door mirrors behind her. She stood angrily with her hands on hips. She was clearly frustrated, but her emotions were comically offset by her ginormous cock, which was lifting her towel to reveal her huge balls as it poked out rigidly.

"Do you think, uh - maybe I could do that too?" Melissa asked hesitantly. Mike grinned.

"Sure Mom, turn around," he said, and slid down the bed so that his pelvis rested near the edge.

Melissa sighed and rolled her eyes but did as she was asked. The outline of her natural ass revolved into Mike's view, but the front of her body remained visible in the closet mirrors. Melissa made eye contact with Mike in the mirror and waited expectantly.

"Step backward," Mike ordered.

Melissa complied, stepping back so that her calves rested against the bedside. Her curvy butt grazed the shaft of Mike's cock through her towel, causing both parties' cocks to twitch with interest. Mike lifted up the cloth with one hand and slapped his cock rythmically against each ass cheek with the other, enjoying the wobbling recoil of his mom's butt. In the mirror, Mike could see Melissa's cock ripple with each slap, clearly enjoying the same stimulation. It stiffened and rose even higher against the towel's weight with each electrifying impact. Melissa moaned and pressed her hips further back into Mike, mashing her supple buttocks into Mike's shaft. Mike guided his thick cock inbetween his mom's ass cheeks, unable to resist gently thrusting his hips upward between them.

"Fuck that feels good," Melissa growled, "but I'm still not getting any bigge - UNH!"