Unfortunately for Jeff, or fortunately, that depends on the point of view, the chronivac was never made to torture people, thought it's creator should have thought again about it's possible uses. This means that no one could not enjoy their transformation. And while Jeff was conscious of his dire situation, he would find pleasure in being used as what he now was : a diaper.
An hour had passed and Cassie, being the baby she was, was still sleeping, but the rumble coming from her belly was proof that food had made it's way through her organism. She farted. Jeff just felt the air going through his "body". Being farted in is not really part of his "job", but it wasn't something he could do without, so the chronivac had decided he would just be indifferent to it. Still, it woulnd't go the same way with what was coming next. Slowly but surely, a mass was coming put of Cassie's asshole. It began pushing against Jeff's body which mind was blown in pleasure. The pleasure of being pissed in was weak enough, and thus Jeff's human brain had mistook it as him enjoying the taste of it. But this was on a whole other level, and as shit was slowly filling him, Jeff's brain could only make one conclusion : he was a diaper and he was supposed to be used. No. He needed to be used. He could never live without knowing such pleasure ever again. And thus Jeff embraced his new life of an everlasting diaper.
Cassie, being the baby she was, was still asleep but the poop in her diaper was making her full unconfortable and she would soon wake up crying.A few minutes later she did. Jeff's mother soon came to her. "Is little Cassie awake ?" she rethorically asked as she sniffed the air. "Pew. Did someone make a stinky in her diaper ? Or should I say, in her Jeffy !" she laughed. She couldn't help but finding the fate of her son rather funny and, she had to admit, a little arousing. She might one day turn him back, but not as long as she babysitted Cassie, and probably not before long after. Who knows, maybe she would restrain herself at just transforming her son. But those were thought for later. For now...
"Jess, could you please come down change Cassie. She has filled Jeff." Jess soon came, gigling to Cassie : "Did she ? Did little Cassie fill my diaper brother." She took a quick glance at the baby's bottom. "Not a leak. We were right Jeff. You make a much better diaper than you ever did as a human being !" she laughed. Little did she know was that at the time being, the Jeff she knew was far gone, and while he was still conscious and hearing, those words pleased him as he was thus fulfilling his new purpose. "Yes. I am a diaper. While this is a little degrading, I am stuck that way, might as well be a good one. Who knows, maybe they'll decide to turn me back." he reasoned, thought, even if he didn't want to admit it, he no longer wanted to turn back.
"You know what to do Jess."
"Yes. I take off Jeff and change him in a fresh nappy and replace him under Cassie"
"Exactly".
Jess went upstair to the changing table and began doing the manipulation.
"You know Jeff when I see Cassie wearing you, I wish I could be diaper dependent and wear you all the time."
Behind the door, her mother heard her.