In his reduced state, Jimmy's options were very limited. Being mentally-regressed back to babyhood was a bad enough option, but being unborn sounded even worse. So Jimmy had to swallow his pride and slowly nodded to Jennifer so she would understand.
"Good boy," said Jennifer cheerfully before nodding to Ashley.
Ashley smiled before picking Jimmy up gently. "You are so cute," she cooed before she held him up to her left breast. Jimmy looked at her nipple dubiously but he really had no choice now. With reluctance, he latched his mouth over the nipple. After a bit, the suckling started to soothe him, probably his baby body's feeding instinct that was making him relax. Ashley was moaning softly. Bobby had sucked on her titties before, but this felt a lot more natural.
Once Jimmy looked like he was going keep suckling, Jennifer nodded to Bobby. It was time for the second part of the plan. Bobby rubbed the ring and quietly said, "I wish Jimmy would physically and mentally age 8 years while he's still suckling Ashley." He could feel a warmth in the ring and soon after, Jimmy started to grow. The short brown hair on his head became less wispy as more of it grew. Ashley soon had to adjust her hold on Jimmy as he became bigger, more of a boy than a baby.
However, Jennifer's plan hinged not on Jimmy's physical growth, but on his mental growth. She had Bobby restore his 9 year old mind before she made Jimmy start suckling Ashley. Thanks to some easily-overlooked wording, Jimmy will keep aging in mind as well as body and she figured the mind of a 17 year old would be more open to embracing maturity. Indeed, as Jimmy grew, his thoughts began to wander. Schoolwork that he had been struggling with before now seemed childishly easy, several references he had heard before now made more sense. Most importantly, he became increasingly aware that he was sucking from the breast of a drop-dead sexy woman. When he first saw Jennifer as a grown up, he was more annoyed that she was older than him than caring what kind of body she had. Ashley had the same sort of body, perfectly curved and tone, her golden blonde hair framing a beautiful face, blue eyes half-looking through her long lashes. Jimmy hadn't really appreciated feminine beauty until he saw her.
Eventually, Jimmy became a little too heavy for Ashley and she sat him back on the bed. He was already almost finished aging anyways. Ashley allowed him to keep sucking for a little longer after he stopped changing before she pulled back, her nipple leaving his mouth with a slight 'pop'. Now Jimmy was back to the way he was before he was aged down, except now he was naked which made his little boner all the more noticeable. He also had a more knowledgeable look in his yes.
"There we go, you're back to your old self," said Jennifer, "Now just keep out of our way while we do our grown up thing." She, Bobby, and Ashley started walking towards the door. If Jennifer was right, Jimmy would call out in 3...2...
"Ashley, wait!" called Jimmy.
Ashley turned around and asked, "Is there something you want?"
"I...I want to keep suckling," said Jimmy, his face blushing red.
Ashley smiled before walking back. She climbed up onto the bed besides Jimmy. "So, you want to suck?" she asked coquettishly, her breasts looming up into Jimmy's face.
"Ye...yes..." said Jimmy, his eyes locked on her breasts.
Ashley sat up on her knees and grabbed the waistline of her running shorts. She pulled them down along with the panties underneath, giving Jimmy an undisclosed look at her pussy. She slit her shorts and panties down to her knees before adjusting her legs, allowing her to kick them off. "You want to fuck?" she asked huskily, her naked body looming over Jimmy's.
Jimmy's face turned a brighter red as his eyes looked over her naked form. But the answer was solid and without hesitation, "Yes."
Ashley turned and nodded to Bobby who rubbed the ring and said, "I wish Jimmy would physically and mentally age to 20." Jimmy could feel his body growing again, his height increasing as he took up more of the space on the bed. Filled with new confidence, he reached up and latched his mouth onto Ashley's right breast. Ashley moaned with pleasure. Now Jimmy was giving him the same ministration that Bobby had and it felt just as good. She subtly arranged herself until she was hanging over Jimmy's growing body.
Jimmy soon entered puberty and it seems like he'd be an early bloomer. His arms and legs stretched out quite a lot, giving him a gangling appearance. His baby fat had drained out, making him look rather skinny, though his face was becoming more mature. His boner started becoming longer as the balls underneath it dropped down and started growing. Ashley reached one hand down and slightly grasped his member, making Jimmy moan into her breasts. She stroked it, urging it to grow bigger.
Jimmy's body soon left its awkward early teens and started to bulk up. Thin arms and legs soon became thick with muscle, his chest expanded out as his pecs and abs became defined. His balls were growing more hair as they got bigger. His dick grew bigger in Ashley's hand until she decided it was the right size. After taking aim, she impaled her pussy upon it. Jimmy's mouth left Ashley's breast as he let out a deep moan. Ashley got a better look of his face, so solid and strong. He was just as good-looking as Bobby or Mike. Jimmy gave Ashley a winning smile before he started thrusting into her. Ashley moaned as she felt his dick going in and out of her, growing bigger inside her as he went. She bucked her hips and started moving in time with Jimmy. The two of them moaned, becoming more synchronized as they sped up. Finally, both of them let out a louder moan as they hit their climax. Then Ashley laid down across Jimmy, her big breasts squishing against his broad chest. She brought his face close enough to her and they started making out.
"So, Jimmy, still think you should be the older brother?" asked Jennifer.
Jimmy broke off the kiss and said absently with his new deep voice, "Uh, not really, I'm good with this."
"Even though we're the same age now?" asked Jennifer teasingly.
"Jennifer, can't you see we're busy?" snapped Jimmy, sounding rather annoyed.
"Yeah, get your own room," said Ashley before she went back to kissing Jimmy.
Jennifer shrugged and said, "Well, you heard them, let's move along." She and Bobby left Jimmy's room as her brother and best friend kept making out. Jennifer closed the door behind them before turning to Bobby, "Now that everyone's taken care of, how about we go back to where we were before we were so rudely interrupted?"