Getting down with the thiccness.

Monica was still lazily humping her softening dick into Adam's jiggly tits, her eyes staring at the wall focused on nothing, when a dull ache began to spread through Adam's face, beginning from the jaw. Panicking, he tried shoving his mother off of him, but found he was too weak to fully move her.

"Mom! Get off, I need to..."
"Oh, sorry sweetie, let me..." Monica answered, swinging her right leg on one side of Adam's ribs, letting him stand up. The frightened look on his face made her dick twitch. Adam's mother didn't understand - she loved her baby, so why was it so exciting to see him like this? Confused, she knelt on the ground and looked on as Adam stumbled over to the sink and stared into the mirror with wide eyes.

His face stared back at him, pale with fear. By now, the dull ache had reached his cheeks and kept on spreading upwards. When it had reached his eyebrows, a faint creaking began in his jaw. Before Adam's horrified eyes, his jawline softened and became less angular, the wave changes slowly creeping up. As it reached his lips, the began to bloat up, becoming puffier and fuller.

"No, no, no! Not my face! Why my face?!"

Adam was so caught up in the transformation of his face that he didn't notice his mother moving. Her son's **** pleading made her cock tingle, and Monica had noticed something he hadn't: His flat ass and slim thighs were swelling slowly inside his pajamas. Getting up shakily, she began walking over to her distracted offspring, her prick quickly reaching full hardness. It ached slightly after cumming twice in quick succession, but Monica didn't care.

"Oh god, my cheeks! No, please, nooo," Adam pleaded, grabbing his face as his cheekbones grew more prominent, trying to **** them back in - but it was futile. While his cheeks still reshaped, his eyesockets and brows began changing; more subtly but undeniably feminine. Suddenly, Adam yelped as he felt hands sliding down his pajama bottoms and grabbing his ass from behind. Using the mirror to look behind him, he saw Monica standing there, her eyes focused on his butt. He felt her massive, throbbing rod slide between his buttcheeks and confusion crept into his panicked mind. How was his behind big enough for his mother to... oh god.

"Mom, please, no! You can't..."
"But your butt is so cute and juicy," Monica cooed, humping her hips back and forth between the pliable flesh, her hands sinking into Adam's ass more and more. Precum dripped from her slit onto his lower back. The feelings sent shivers up his spine and jolts of pleasure into his snatch. Adam could feel his juices drip down his thighs - and noticed that they touched. His whole lower body was swelling!

"Please don't! I'm not done growing, and I... Ah!"

"I know, it's so sexy... I can't hold back, sweetie. Pleeeaaase let me fuck you?"

"You can't... mmmh, your dick's so hot... No! We can't... nnh..."

But the warmth spreading from his legs and hips through his whole body slowly slowly overpowered his resistance. Hadn't he watched lots of porn where the guy never penetrated his partner? And from this position, it was impossible for his mother to get cum on his face, right?

"Haaah... Alright, but put it between my thighs. Mmmmh, I can't take another load..."

"Oooh, thank you-- ah! Sweetie... I'll be cautious."

As she shifted her hands from his ass to his slowly widening hips for leverage and slid her shaft between Adam's girlcum-slickened thighs, Monica thought about what a good mother she was. Her poor baby had been so distraught, and now he was moaning with lust instead. Much better. Adam meanwhile had grabbed the side of the washbowl to steady himself. His pendulous boobs swayed in rough circles, brushing against his arms every time Monica's hips made contact with his own. Focusing his attention from his mother back to his face, he didn't recognize himself for a second: A smoking hot woman looked back at him, her high cheekbones flushed with arousal, mouth slack in an unabashed 'O' of pleasure. His hot breath was fogging up the glass with every lewd gasp.

"Aaannh, your cock is so hot... sliding over my pussy... Ah!"

"Aww yeah, and your pussy is so... oooh, so wet. Feels so slick..."

Monica's humping grew increasingly forceful, her hips slamming into Adam's made his expanding ass jiggle with every thrust. Loud slapping sounds filled the bath along with their passionate moans. Adam's pussy was on fire - the throbbing cock sliding over its lips sent shocks through his lower body with every stroke. He closed his eyes, enjoying the feeling. And if he angled his hips just a bit differently, it would split him open and feel even more amazing... But he couldn't! He would change even more - or worse, get pregnant. From his own mother!

"Nnngh, baby, your thighs are amazing! Soo soft..."

"Ah! Hah, yes! Keep fucking them!"

"I couldn't-- oh! Stop if I wanted... Oh god, YEAH!"

Adam's eyes shot wide open, a wailing moan rising from his wide open mouth. Either he had subconsciously shifted his hips (or his changes had) or his mother had moved hers, but the result was the same: Her fat prick had found the entrance to his virgin snatch and Monica had rammed it in up to the hilt.

"Nnhooo, take it out! Please, you--Aaah~! You can't come inside!"

"Don't worry, baby, ooh YES! So tight... I'll--ngh! I'll pull out."

Her eyes were still glued to Adam's huge, bouncy ass, small waves traveling through the fat with every one of her frantic thrusts. His hips were wider than his shoulders by now, his thighs thick enough stretch the fabric of his pajama bottoms. The velvety tightness around her cock was almost too much to bear, Adam's pussy greedily sucking his mother's meat back in with every backwards stroke. He began moving his hips back in sync with Monica's to **** her veiny dick deeper inside of him, her swollen head bumping against the entrance to his womb at the end of every thrust.

"Mmmh, yeah! You're twitching around me! Do you like mommy's cock?"

"I... ah! Love it, hmmmh... it's huge... sooo good..."

"Then I'll... oooh... keep fucking you as much as you--ah! Want, baby..."

The dirty talk and the prospect of more of this glorious feeling made his lust rise, so Adam moved his right hand to his previously neglected breast, cupping it and letting his fingers play over his engorged nipples. He hadn't noticed until now because of the all-encompassing pleasure gripping him, but now that he had it in his hand, it became obvious: It wasn't only his ass and thighs that were getting bigger. Slowly, the jiggling fat on his chest drooped over his hand, the left tit still swaying wildly in a rough circle, slapping into his arm and right boob. The throbbing cock pistoning in and out of his pussy spread him so wide and reached so deep... Adam felt a rush of bliss wash through him.

"Oh god! Oh god, mom, fuck me harder! I'm ... NgaaAAAAH!"

With the last words, Adam's voice broke and a high-pitched, exultant scream of pleasure ripped out of his throat. His pussy clamped down on Monica's dick, spasming wildly. The sudden increase in stimulation proved to much for her overworked cock, and she felt her own climax approaching fast.