Despite the amazing sex, Bobby found his thoughts turning towards Jimmy. Even though some people might think he was a dumb teenager concerned with only sex and using his powerful rings to gain more sex, he actually did have feelings and a brain. And his brain was starting to re-think his attraction to Jennifer after how she'd treated her brother, and of his own part in it. Maybe it was just her hormones overpowering her reasoning, but Bobby was starting to think that as an impartial participant he should help Jimmy get his own back.
Quickly he took a shower and then, as he pulled back his underwear and jeans he asked Jennifer where she put her brother. "Oh I put him in an old crib I found. He's all bundled up like a good little boy," she said "That'll serve him right for thinking he can't boss me around."
Bobby, making use of his slightly longer twenty one year old legs quickly walked to the parents' room. There he saw the baby Jimmy sleeping soundly in the crib, covered in a blanket and diapered. If he woke him up at the moment he might cry. "Let's see... I wish that Jimmy would become five years older," Bobby whispered.
Instantly Jimmy began to expand and grow and Bobby quickly lifted the now three year-old out of the crib and placed him on the bed before he became too big for it. As Bobby watched the boy grew another three years until he was six. Bobby had to admit, good looks were clearly in Jennifer's family; everything from Jimmy's slim body, already quite athletic for a six year old, to his swept brown hair and, currently closed, large brown eyes, to his shapely face and white teeth was absolutely adorable. "Hey Jimmy," Bobby said, shaking the boy gently.
"Huh, what?" Jimmy muttered, opening his eyes.
It took Jimmy a moment to remember what was going on, and why he felt smaller than normal. "What do you want?" he asked coldly as he remembered what happened.
"I want to help you get Jennifer back."
"You? Why will you do that?," Jimmy spat.
"I don't know how was your relationship with Jennifer in the past, but now we're adults and we need to behave properly."
"Maybe all that hair in your chest is blinding you but I'm a little kid, so I'm acting my age."
"Well..." Bobby said, sounding almost sheepish, "That was sort of my fault."
"What?" Jimmy asked, not sure if he should be shocked or furious.
"It's these rings," Bobby said, pointing to the two rings he wore, "One ages people and one regresses them. I practiced them on your sister and her friend and it's kind of been a bunch of sex since then."
"Now I see, their rapid aging has left them unable to adjust to handle their emotions, and they've never been taught about that sort of thing," Jimmy muttered.
"You sound way more mature than I expected," Bobby said, "Do you want me to restore tou to your real age?".
"Are you stupid? Of course I want to be back to my age!" Jimmy yelled at Bobby. It was almost comical that a little boy talk to a man like that. "Who wants to be a damn toddler?!"
"Alright, alright. I get it. You don't have to be so rude," Bobby said, "I wish Jimmy to become four years older."
Immediately Jimmy felt himself growing, gaining size and watching as the floor got further away. He also noticed the little muscle he'd earned through sports and martial arts come back. "You know Bobby," he said, now eight years old but still a lot smaller than the 21 years old Bobby, "I do gymnastics, and I know I'm tall, but that makes it more challenging."
Now he was nine and he waited just another couple minutes as he aged one more year leaving him at ten. His brown hair was long and shaggy, a skater cut, which was appropriate because skateboarding was one sport he did. His face had lost all its chubbiness, but was still clearly a child's face and as well-formed as ever, and his brown eyes looked as large as ever. His torso and legs had retained their definition, and increased as he'd aged. For his age he was decently well muscled and very athletic. He was sure he was now about five-foot even.
"Were you 10 years old originally?" Bobby asked him. "I remember you were a little bit smaller."
"I was 9 years old." Jimmy said. "But I don't complain, at least I'm not old enough to be a furball like you."
"Oh, I can fix that." Bobby said. "Make Jimmy 11 years older."
"Wait! No!!" Jimmy tried to stop him but it waa useless. He felt himself grow and age, he quickly grew very well muscled, his pecs, abs, biceps and lats all clearly bursted out with excellent size and definition, giving him a v-shaped back over his firm round buttocks and toned legs. The bulge was decent too, and he quickly became as tall as Bobby. He was hardly a bodybuilder, but he at least had a gymnast-swimmer body that made him look very much like a jock. "Why did you-, woah, my voice changed."
"And you're not done yet." Bobby smiled as he watched hair sprouting all over Jimmy's body. He was tall for his age, as usual, well muscled and as hairy as Bobby but his good looks had remained, leaving him with a handsome face with a boyish charm, like a surfer.
"Come on! A furball too?" Jimmy said as he watched his hairy armpits and chest. "At least, can you give me some clothes? So, I won't have to see this." He pointed at ths bush of pubes around his crotch.
"Sorry, Jimmy." Bobby said. "I don't have clothes for me neither. Don't you see I'm wearing a towel?" Jimmy sheepishly blushed. "Who is the moron now?"
"Ok, then what?" Jimmy replied. "Are you expecting me to walk naked? My little sister is out there!"
"Oh hoho. Believe me. She won't mind." Bobby smirked as he stared at Jimmy's plump ass.