Well, the day did leave him exhausted...

Adam changed into his pajamas lay down on his bed, intending on surfing the web on his phone, but he quickly realized how taxing the day had been for his body and mind. His eyelids felt like lead and his head felt as if it was stuffed with cotton. With a huge yawn, he set down his phone on the bedside table, slipped under the covers and quickly fell asleep.

His exhausted mind only conjured up senselessly weird dreams that shifted and twisted and were forgotten the second he woke up. Thanking his luck that he didn't have a wet or otherwise sexual dream, he grabbed the clothes he wore yesterday and pulled a face. He really didn't want to wear them again, but considering his normal clothes were a recipe for disaster he hadn't much choice, as he had seen the day before. At least he didn't have to go out thanks to summer break and his sister Sarah would be gone for a few more days on a trip with her friends, so he could put off facing someone else in his changing body.

As he approached the bathroom, he heard a sound that made his heart leap out of his chest. Slowly he crept closer, heart hammering a staccato rhythm against his ribs. Adam reached the door and pressed his ear against it. He could hear the shower running and... there it was again. Was his mother moaning? It had to be her, no one else was home! Adam's face felt hot as he knelt down to peer through the keyhole.

He could not believe his eyes. Their shower had doors made out of non-frosted glass, so his mother was completely visible. Her soft breasts were on full display, her left hand kneading them and pulling on the stiff nipples. Soft moaning and lewd gasps filled the bath, only partly droned out by the sounds of falling water. But that wasn't what made Adam's mouth dry and his pussy moist: Monica's other hand was not rubbing a wet cunt, but a glistening, throbbing shaft growing where her clitoris should have been. Her hands circled its angry purple head with every stroke, hips bucking into the tight embrace of her fist. How...?

"Mmmnnoooh, Adam," his mother's sultry moan derailed Adam's thought process for the moment. He knew that their relationship was... weird now, but it still took him by surprise to hear Monica utter his name in this manner.

"This thing feels so... ooooh, so gooood..."

Adam's mind reeled. Where did his mother... The realization hit him like a ton of bricks. His girlcum! If the Growth-X pills could give him a vagina, it could probably do the reverse for his mother - and apparently his juices had taken on transformative properties of their own. He had done this to his mother. It was his fault she now had a penis, and it was looking so... tasty...

"I wish I could... aaaahnnn... try this out with Adam... but that would... nnnhhh... wouldn't be fair for him..."

His mother's concern for Adam barely registered with him, lust slowly overtaking him. His pajama bottoms felt sticky and clung to his pussy, so he moved down one hand to move the fabric. But the mounting arousal was too much for him: As his hand made contact with the pajama stuck to his snatch, pleasure shot through his whole body. Adam's limbs froze and the breath caught in his throat. It was all he could do to not to moan out loud.

"Hnnaaaah, yes!"

Obviously, his mother had no such reservations.