The days passed by. Mark decided to humor Aiden's changes for a few weeks. He figured it was the right thing to do. After all, Aiden had been such a good sport about the changes Mark had made to Aiden's body. It had been quite some time since Aiden had any male equipment between his legs.
For Mark, there had been quite an adjustment. His "muscle tits" grew uncomfortably heavy and full each day. He needed to be milked twice a day: once in the morning and once in the evening, usually before bed. Mark admitted it was a bit inconvenient. Aiden would nurse on Mark's round pecs to relieve the pressure, but if he wasn't around, Mark had been resorting to one of those breast pumps for new moms that you could buy online. Otherwise, his big muscle tits would leak. Indeed, they sometimes did so randomly. Mark could wake up in the morning and find the sheets damp, his hairy chest matted with his own milk. Or if he strained a little too hard in the gym, damp spots would appear in his tank top. It was embarassing. But the good part was that after Aiden had his fill of daddy's tit milk, they were both pretty horny. Mark would then slam Aiden's tight pussy afterwards, sometimes while the milk was still dripping.
The constant nursing had left Mark's already big nipples swollen and distended, and painfully sore. Aiden would tease them and yank them when he could, making Mark cry out in pleasure and in pain.
But now the couple was ready for Mark to go back into the Chronivac and undo those changes. With a few clicks of the mouse and a short pause while the program worked its magic, Mark's body shifted. The silver daddy was disappearing before their eyes. Mark's graying hair darkened. The silver stubble on his cheeks turned black once more and filled in to a create a dense beard, matching the furry moustache that completely obscured his upper lip. His body hair changed to match. Mark's pecs tightened up a bit, but they still looked huge and round, with those same sensitive nipples poking out from a forest of dark hair. The piercings disappeared, but to Aiden's delight, Mark had kept the colorful full sleeve tattoos that adorned his arms all the way from the boulder-like shoulders and biceps down to his thick hairy forearms. Mark's tall, muscular frame remained the same, as did his thick legs, hairy, muscular ass, and big package.
"Looking good, Daddy!" Aiden said. "Thanks, my little pussyboy," Mark answered, his voice deep and gravelly. While they were on the Chronivac, should they change anything else?