While he was indeed enjoying himself, all this was going a bit too fast for Jim. He then thought of a way to calm Matthew down a bit.
“How about we age down first? That way the jump to dad’s age is way more impactful? Let’s be 8 like Walt and Cal.”
“I like the way you think Jim. That’ll make the final result all the more satisfying.”
“Let me get their shoes!” Matthew quickly came back with matching pairs of sketchers with cars on them.
“Do me first Jim.” Matthew completely stripped and started stroking his shaft.
“I wanna see if I can cum before the change finishes. Don’t let the air out too fast now haha!”
Jim nodded.” Control Matthew’s age.”
Jim slowly let air out of the balloon as his brother’s muscles begin to lose definition. Matthew noticed his hair retract into his body as well as his penis. He looked about 16.
“It’s so weird getting harder as my cock actually shrinks!” He laughed.
Jim was surprised by how much he was enjoying this. Ge hoped that after hit regressed to before puberty the lack of testosterone would calm him down. He was still going hard at it at age 12.
“Almost tHeRe.” his voice cracked.
At age 10 he burst.
“Welp, it was fun while it lasted. I don’t think I can even get hard anymore at this age.”
He stuck is feet into the shoes and told you to stop when they fit him comfortably. Jim let the air out ever so slightly after his brother told him to stop for good measure.
“Wow I’m really 8!” Matthew said as he posed with his new younger form in front of a mirror.
Matthew walked up to you and grabbed Jim’s older penis to his surprise.
“Damn, it’s crazy to think my cock grew from this little thing to the size of your monster. Oh, check this out!”
Matt hopped onto his brother’s feet.
“I can literally stand on your big feet with my little ones!”