"Okay, since we're both clearly excited about being in each other's bodies let's take advantage of this.." said Jeff's dad from his former body.
Walking up to the bed, he could tell that his son was considering the offer. "I kind of want to know what it's like to fuck my hairy, manly bubble butt," said Mike as he cupped his former ass with his son's young hands.
Jeff was so turned on by the prospect of being fucked by his old body and encouraged, "Well.. I guess my teenage penis is the perfect size to take this virgin ass of yours.."
Mike knew that was a yes, Jeff, lying on his back, lifted his father's powerful legs into the air after scooting to the edge of the bed, offering his father what had just been his asshole. Mike eagerly took the Vaseline from the nightstand and lubbed up his new 16 year old penis.
Jeff quickly learned how to relax his father's hole and soon they were pumping rhythmically together. Mike couldn't believe how hot the expression was on his old body's face, and Jeff felt that Mike's prostate was finally getting the attention it was begging for.
Both were on the brink of orgasm when something totally unexpected happened. The chronivac was still on the default setting which reversed all changes after 30 minutes. Suddenly they were back in their old bodies, and Mike saw his son's face as he was about to orgasm, fucking his own father. Neither of them were able to stop, and both came harder than ever. Mike was blushing intensely realizing that he had been accidentally fucked by his own son. Jeff felt a surge of pride, his father would never again be able to consider him his inferior. Best of all, this had all been recorded on Jeff's phone.