Jeff had spent a few minutes thinking about it before deciding what to do. He would become Alice's twin sister. But it wouldn't be a quick change, that would be boring, he would set it so that reality would slowly shift as he changed from a guy unrelated to Alice, to her twin sister.
The chronovac would come with her since this was a human change thankfully. And as Jeff set up the last bits of information that would start his transformation he made sure that this time he set it so that it would take a week, including weekends. And there was no timer as to how long it would last, he would remain that way until he changed it again with the chronovac.
Jeff smiled as he clicked start, leaning back in his chair for a moment still naked, only for his chair to dissaper under him again.
This time he landed on a bed, he was clothed in a pair of pajamas and laying next to someone. Turning over in the bed Jeff smiled as he saw who it was, Alice, his soon to be twin sister, laying next to him.
"Ugh... Jeff why are you awake so early, it's a Saturday." Alice complained as Jeff shrugged.
"Sorry Alice, I just woke up." Jeff said as Alice sighed and got out of bed.
She went to the closet and gathered herself a change of clothes before going into the bathroom, leaving Jeff to sit in their shared bed as he sat up and threw off the covers.
Jeff looked rather normal as he observed himself, nothing had changed yet as he looked at his pajamas, which were a normal boy's set. It was nothing special as Jeff got out of bed and went to the full body mirror he knew was in the room and undressed.
Standing naked in front of the mirror Jeff didn't see anything that had changed yet. Though given the change was going to be slow he wouldn't expect anything major yet as Jeff looked down at his penis. Holding it in his hand he cradled it as he frowned, he didn't want this hunk of meat hanging between his legs, and soon enough it would be gone.
Jeff was standing in his underwear outside the bathroom door with his own set of clothing waiting for Alice to get done. She got done soon enough and the two switched places in the bathroom, Jeff turning on the hot shower again as he put his clothes on the counter.
Getting in the shower naked he started washing, but decided that after he finished he would observe himself for a bit to see if anything would change. He had lost his dick and balls during his first and second day of the of his swimsuit changes, so maybe the same would happen here.