Mandy was able to easily give the penis shrinking formula to Cody by mixing it into the protein shake that he drank every morning before jogging. They needed to be given once a week. She managed to break the ampoule and pour it in to the blender cup on the counter just as he came for his first dose. He strolled up in his old 10th grade track shorts, his heavy member pressing a curvaceous, straining bulge into the front of the thin, blue fabric. "sup, Mandy" he said again, then chugged the shake. Next he placed one leg up on a nearby stool and did some sort of lunging stretch. Mandy heard a loud slap near the floor and her eyes flew down to see the short, fat head of his cock, like a cocktail umbrella, and about three inches of coarse shaft, dangling out of the leg of his shorts.
"Cody!" she exclaimed "Why aren't you wearing briefs?" Cody looked down at his own fat cock and grinned.
"I guess I am getting a bit too big for these now. But they have a netting and it just slips out when I do that stretch sometimes." Then he brazenly hoisted up his cock and laid it back into it's rounded cradle in Mandy's full view "See? No problem" He motioned to the prominent bulge in his pants as if it were not a huge distraction. He walked away and the bulge bobbed up and down with every step, like he was smuggling a coconut. She thought about him meeting Carol, her friend in the neighborhood who jogs, and Carol watching her son's bulge and lusting after his huge cock like he's an adult.
She needed to keep her from fucking her son, what if she already had? He's far too irresponsible to have that big cock, he would do it in a heartbeat. She realized that he had intentionally dangled his cock in front of her to show her how powerful he was. He really believes he's a grown man.
When he came home he went to the shower and Mandy heard the rhythmic slap of his balls from outside the door. 'He's masturbating' she thought. She needed to get an idea of how big his cock actually was so she'd know how the treatment was working. So she slipped out into the backyard and around the house to the little curtained window looking out of the shower. She glanced around to make sure none of the neighbors were watering the hedges or anything, and then covertly approached the window and peered through the edge of the curtain inside. He hadn't finished yet, and Mandy was shocked, him masturbating was just nothing like she'd imagined. When his father had done it with his thin, 5 inch penis he'd lazily wrap a thumb and forefinger around it and move up and down the length while cradling the balls with the other three fingers. But Cody stood in the shower, crouched, with his legs spread wide, as if he were trying to lift a heavy weight. He had both of his huge hands wrapped around the 10 inch long monstrosity in a death vice, It had gone from beer bottle thick to beer can thick. She realized that he needed to spread his legs apart as he jerked it or else they would crush the enormous engorged root protruding from his lower pelvis. His hands flew up and down the length of it, crashing against each other occasionally like clashing titans. flinging huge splashes of water around the shower in the enormous arc. He looked positively angry, sweating, as if just getting that gigantic cock to orgasm is a strenuous workout.
'My poor baby. It takes him so much effort just to keep all the blood in it, I can see the real you when no one else is there, you're showing me that it's too stressful and strenuous to take care of this big cock. What if you have a heart attack because it's too hard for you to masturbate your huge cock? Don't worry, baby. I'll make everything all better. I'll give you a little penis that you can handle until you're ready for the responsibility of a big one.'
But Mandy had honestly never thought of how to return it to its massive size, she didn't think he'd ever really be ready to be an adult. But his huge cock worried her, maybe this dosage isn't enough.