After spending a long time thinking, Melissa smiled wickedly, "Now that we know how the program works what do you say we see what else we can do? There were a whole lot of options that we never even looked at."
Jennifer shuffled her hooves and flicked her tail, "I don't know, don't you think that's mean? Maybe we should just change him back."
Laughing, Melissa patted her friend on her equine flank, "Don't worry, as long as we keep him unaware and make it so reality adjusts no one can ever know. Besides, undoing the changes only takes a click. I do know that I saw an option to restore default settings. It'll be fun."
Still not sure how she felt about it all, Jennifer agreed. Maybe this was all just a strange dream, and if so there was no reason not to go along with it.
Once outside Jennifer broke into a slow trot, forcing Melissa to run to keep up. Realizing what she was doing, Jennifer stopped and offered her friend a ride since, as strange as it was, she had liked letting Melissa ride her before. It was a chance to show off how strong her centaur body was, not to mention she realized that she liked the way her friend hugged her to hold on. She had always been slightly interested in girls and this felt like a safe way to indulge in her curiosity.
Together they went back to her room to decide what to do next.
The first thing they did with the Chronivac was turn Brian back to normal at Jennifer's insistence. Afterwards Melissa spent a long time looking through the mental change options, which seemed to fascinate her the most. In the end the two of them ended up playing with the sexuality and fetish options since they were the most interesting. They chose several options from the lists there and, at Melissa's insistence, made it that he would be aware of the mental changes since, according to her reasoning, if they were mental they wouldn't upset him too much.
Then they moved onto the physical changes, selecting numerous human and animal traits that they thought were interesting or went well with the mental changes they were making. Brian would be unaware of these changes and reality would adjust for all of them, both physical and mental, so no one would find anything strange about what he was or how he acted.
Lastly they set the time over which the changes would happen, deciding that a week would give them plenty of time to watch what happened and really get to see how he would react to the slow mental changes and how people would treat him differently as the physical changes got more intense.
---
In his room Brian was back to doing his homework, unaware that earlier that evening he had been a pregnant man. For now he was back to normal, but the first changes were already starting.
Shifting slightly in his chair, he leaned back and stretched, then kicked off his shoes. For some reason his toes felt strangely cramped in them. Tomorrow he figured that he'd go out on a shopping trip, the thought of which excited him more than usual, which he blamed on having spent so much time studying and not enough time getting off campus. First though he wanted to get this essay done. It wasn't due for another two weeks, but would feel better having it done.
While he worked, he ran his fingers through his hair, noting that he was overdue for a hair cut. it was long enough that it was tickling the tops of his ears...