"I want to be twenty-two," Mike finally answered. There was a confidence in his voice that hadn't been there.
"Alright," Jeff started to input the age difference from what it had been. He changed the data of his dad and then hit enter.
Mike only grew more antsy as he watched the information changed. At 44 he wasn't exactly odd, though he wasn't really young either. Age had caught up to him and a bit of a belly formed around his waist line. Any muscle that he had was completely covered in fat. Hair grew all over his body and was incredibly thick, except for the top of his head. He couldn't help but envy his younger self.
"When's it start?" Mike asked. His hand gripped the back of Jeff's chair in anticipation.
"I think it has..." Jeff stared at his father, slack jawed. His eyes traced his father's face and body.
Mike instantly noticed what Jeff was doing and rushed to see a mirror. It was like he was already 5 years younger. He could see the hair on his body starting to recede, along with his belly. The bloat seemed to have started slowly, then happened all at once. And he could actively see his body changing. Every couple of seconds seemed to take another year off his life. The wrinkles and smile lines around his face started to soften and smooth over. The roughness of his skin softened giving his face a far more youthful look.
However, Mike was far more interested in his muscles. He could see his fat rapidly receding. His body grew tones and slightly muscular. He had never been totally fit, but he did have a descent amount of muscle on him. And without any of the hair covering his body, he looked all the better. Mike gave himself a flex in the mirror, watching the youthful body flex right back at him. His dick hardened and a clear bulge could be seen in his shorts.
"Woah..." Mike moaned as his hand touches his crotch. He gave it a rub and another moan slipped out as his body fell to the mirror. "God damn..." he cursed.
"MIKE!" Jeff felt himself yell. He tried to say 'dad', but that just didn't feel right.
"Sorry little bro," Mike continued rubbing himself. He didn't even notice that he didn't call Jeff son like he usually did. "I can't help it. It feels like I haven't jacked off in fucking forever! I can't stop!" Mike continued to pleasure himself. Hormones were raging at a level he literally hadn't felt in years. They were all happening at once. He could feel his dick begging for attention.
"MIKE!" Jeff yelled again. Watching Mike's face contour in all sorts of pleasure was just too weird. At the same time, he couldn't look away.
Mike only got more into it. He loved feeling his youthful body again. All the energy. All the power. All the strength. He continued running his hands up and down his cock. It was intense. His body jerked and he felt his underwear fill with his cum. "Oh fuck..." he cursed as he felt the massive load fill up in his underwear. A massive stain quickly started to form. He stripped his underwear off and his 8 inch cock was still a little hard. "Sorry bout that lil bro." He smiled stupidly as he pulled his shorts back up over his body.
Jeff stared in disbelief. "M-Mike?" Jeff really tried to force himself to say dad, but only Mike would come out. Both sounded wrong, but Mike somehow felt more natural.
"Sorry little bro," Mike came over and ruffled Jeff's hair just like how he always had when he was Jeff's father. "Just couldn't stop man. It was like I was fucking possessed or something. My body hasn't felt this good in ages!" He raised his arms and flexed the muscle showing off the somewhat defined muscle. Then he wrapped his arm around Jeff's shoulder and looked towards the computer. "So what else can this thing change?"