Jeff sat on the end of the bed.
"In fact, You're right" said Mike, then he sat beside Jeff, "Perhaps you can do me a favor" he held his old body's leg.
"What?" Asked Jeff.
"I want to see how I look when jacking off" he said massaging Jeff's leg.
"Me too. Shall we masturbate together, dad?" Said Jeff.
Mike nodded and then started massaging their new dicks. They both moaned in unison, feeling very aroused while watching their old bodies jack off. There they are, sitting in from of the mirror while stoking their dicks. They started to do it faster, and faster and faster.
"Fff-fuck. Man I look very sexy while jacking off. I never realized that" said Mike, sounded like losing breath.
"Dad, Ugh... I'm gonna cum" Jeff's back arched as he became closer to the edge.
"Me too, Jeff. Fuck! Ugh!" Looks like they'll cum together, "Come here" Mike told Jeff to lower his head and kissed him.
Jeff was surprised but didn't broke the kiss. They moaned while kissing then grunting as a fountain of cum shot out of their dicks in unison. It spreads and reached the mirror in front of them.
Mike finished kissing his son, "It feels weird to kiss myself"
"Haha. You know it" Jeff put his arm around his old body.
"Dad, now it's your turn to do me a favor" said Jeff.
Jeff got the remote and started to change him and his dad.
"What favor?" Mike asked while starting to feel the change.
They are both changing. Jeff is getting younger while Mike is getting older. Now they both look like twins. They are both 18 years old.
"Let's take a shower together." Said Jeff, he stood up and went into the shower room with Mike.
He put the remote on the bathroom sink and got in the shower with Mike.
"Please don't change me back, Jeff" said Mike as he turn the shower on, "I don't want to go back into an adult" he looked into Jeff's eyes.
"Why?" Asked Jeff, "Don't you want to be old enough to be free?"
"Being an adult is hard. Too much responsibilities." He said, "But being young. It feels good. Maybe with that chronivac, you can make you, us, together with your siblings a new father. Then I'll become your twin"
"Sure" said Jeff and kissed his new twin, "Should I call you Mike now?"
"You should" Said Mike and kissed back.