Dylans cock swelled and stood up. It was huge and throbbing with fat heavy balls.
He looked proudly at his sister.
'Guess i wont have any trouble with women now sis' he said.
Karen reached in her bag and pulled out something.
Grinning, she rubbed the item across Dylans massive erect penis.
'Dont be so cocky big brother' she laughed and held up the item for him to see.
It was a pair of kid's underpants.
'I got these for our little cousin Charlie. U know how he loves choo choo trains!'
sure enough , on the front of the underpants was a little picure of Thomas the Tank Engine.
She looked at the label, age 12 to 16 months.
Dylan looked at the enormous thick cock sticking out between his legs. It was still rock hard but already it was beginning to soften.
No, it wasnt softening it was shrinking!
10 inches, 8 inches, 6 inches, it was thinning and losing its impressive length fast.
Dylan tugged at it, willing it to stop as he passed his once normal 5 inch size.
It shrank through his fingers.
4 inches, 3 inches, 2 inches, his manhood melted away.
Gone were his hairy big balls, now a tiny little sack pulled tight against his groin.
The changes finished.
He was horrified.
He had a teeny tiny one inch penis.
He was standing naked in front of his sister with a baby-sized bald dick on display.
'Not such a big boy now' said Karen, wiggling her little finger at him.
Her pinky finger was bigger than his dick!