He didn't take much time to think about what he wanted to try first. His older stephbrother had always shoved into his face that he was larger down there despite their age difference from early on. Even when he was still a kid. He concentrated hard. He wanted to be bigger, a lot bigger than him and for him to be smaller. As small as he was now. He wanted him to be in a situation where he could show off their differences.He remembered when his brother made fun of him for his size first. Back when he turned thirteen. He sighed as he remembered that. He was basically still a kid back then, he had been kind of a late bloomer.
He then looked ahead and was suddenly startled. While he had blinked his surroundings had changed. He looked down and saw the bracelet around his wrist or rather a marking on his skin in it's place. Then he realized his arm seemed shrunk down and the room appeared misty. He looked around and realized that he was nude in the bathroom. Did he get younger? Wait this setting... He looked down but his penis seemed normal for his age... but he was obviously younger... for his s suddenly the door opened and Cody barged in. A younger cody of 17 years old. But something had changed about 17 year old Cody. His quite above average penis was replaced by a penis... that looked like his back when he was thirteen!
He suddenly felt that his crotch was heavy and looked down. His penis had changed. His improved boyhood it was about 10 inches long while flaccid longer than Cody's had ever been. Cody grunted when he looked at him. "Showing off again, you freak of nature?" Matt grinned. "Well, at least I'm popular with the girls." Cody sniffed. "Be careful it doesn't fall off." Matt realized he had already showered and went to his room giggling somewhat over the predicament his brother had been in a reverse of rules so to say. However Cody had been far more antagonizing than Matt had been this time. Matt looked at his penis. "Ah well, what the heck. Before I try and go back to my time I'll give this a go." He thought to himself. He locked the door and opened a webbrowser and started fapping. His penis growing hard in his hand. When it was fully erect he measured it with a tape measure. "13 inches, an inch for every year, damn." He continued jerking off and finally came. Out of breath he concentrated and closed his eyes. When he opened them again he was back in his room but now in his own time.
He leaned forward and felt his penis. "Damn, it must have grown even more the past few years." He let out the hose of man meat, his eyes widened at the massive length of it. He was still flaccid but it already seemed as long as his penis when he was thirteen. He locked the door and started jerking off again. His penis rose and throbbed. Finally reaching full mast he grabbed the tape again. This time he measured carefully, he penis wasn't as hard as when he was younger and smaller it slumped and bended if he didn't hold it up a little. 18 inches he read on the tape. "Damn, I'm bigger than... than... everyone...". His penis throbbed at the thought. He realized it was to big for sex, probably but he still continued rubbing it. He lifted it and walked to the computer. It was heavy in his right hand as he sat for the computer he jerked of to various porn with guys with large penises fucking hot girls. The thought that he was so much bigger than than only made him more aroused. He felt pressure building in his balls and leaned back. "Oh shit..." he uttered as his penis got harder and longer. The almost painful pressure was released through the long rod. A burning but pleasurable sensation followed. There was a delay between the thumping of his balls as they expelled semen and when it shot out of his head. He came four times in relatively small amounts but it felt like 8, he couldn't believe it. When he looked around he was rather disappointed by the amount of cum he had produced.