Dave was laying on the floor, feeling his massive muscles swell and constrict as he breathed. Nate had crawled up on top of him and was laying on his massive torso. As Nate fidgeted, Dave could feel his boyfriends small dick rubbing against his own huge member. Nate was clacking away on the laptop, rubbing the mouse across Dave's huge pecs. "Let's see what I can try on myself now..." he said, patting the huge stomach that propped him up oddly on Dave's frame. "Well, first off... bye bye gut." He clicked the render button, and a short 30 second change was occuring. His huge paunch deflated beneath him, revealing a set of cut abs. He was laying flat on Dave now. He found an odd dial on the side, pulling it up and down, the render of him grew shorter... less toned... less hairy. "Weird. I wonder what the effect comes out as." He notched it down pretty far and clicked "render."
A window popped up. Processing.... 5 minutes. He climbed down off of Dave to see what was going to happen. He felt the itch climb across his whole body again. In a second, he began to change. At first, nothing much happened. The hairs on his chest lightened a bit, same with the ones on his stomach. He thought that his muscles were toning up a bit as well... he looked great! Kind of like when he was 25. The 29 year old felt his entire body over as the changes continued. The hair on his chest and stomach continued to lighten a bit, but his muscle structure began to lighten as well... he was looking like he did before he started working out... like when he was 23. He felt the muscle tone slipping away from him, soon he was down to 150 pounds... he hadn't been this big since his highschool graduation. Finally, it hit him what that dial changed. He had gotten younger! He was 19 again! He hadn't looked at how far he had turned that dial... but he was sure getting horny.
He had to be 18 again... then, he began to get shorter. He was losing years and losing height now. He looked over his youthful body, judging that this was what he was like when he was 16. He dropped in height quickly now, and the little hair left on his torso faded away... there went 15. He became suddenly aware of his 3 inch erection. He looked down, feeling another drop in height. His erection shrank to around 2 and 3/4ths of an inch. His pubic hair pulled in slightly. He was 14... another shrink... he was only 5'6" now... his dick was around 2 1/4th. His pubic hair was only a faint ring around it. His muscles were small and soft.... Another drop! 13 years old now... his development had taken a huge step back... only weigh 110 pounds, he was 5'4" with a 1 and a half inch dick... His pit hair was gone, and his pubes were too. He shrank again. What little development he had left was gone... his dick was standing hard at less than an inch... he was only 11 now... and it stopped.
He surveyed what he had done to himself. His whole body had been reduced by 18 years. He stood only at 5'1", weighed in at only 90 pounds... and with a half inch erection. He simply exclaimed "whoa.", in a high, childlike voice.