"Ugh... This is probably the worst pain I've experienced yet." You inform your brother, referring to the tail that you had just grown in over the course of the last few hours. You then blushed when you noticed your brother's intent gaze upon your hind quarters.

    But you endured the small transformation that was made possible by your brother's excellence in science. He, unlike you, was a genius... The kind that finishes high school before puberty. And while you envied him for his gift, you couldn't hold it against him since he was about as good of a brother as one could want.

    Furthermore, he was willing to share the credit with you for his current achievement in genetics. Well, he hadn't offered that right away... When you had turned down his first offer to be a guinea pig, in order for him to save time and money on finding another subject to test his new invention on, he had then sweetened the deal by sharing the credit and, subsequently, the profits. Although he probably would have shared his profits with you anyway.

    The main reason for why you agreed, was in order to gain some insight about the fairer sex. You hadn't been having much luck with the ladies and your brother was aware of that, so he had suggested that you become a girl for a while and live amongst them, to find out how they ticked. So far you have been a girl for one school week and you were glad that you had decided to help your brother, or else many things that you now knew would have remained a mystery to you.

    The next day you found yourself undergoing another change, the cat traits changing into dog traits. Since you already had a tail, it wasn't as painful this time around; however, your body still ached and you generally felt as fatigued as you had when you had become a girl and a catgirl.

    Your brother's invention, some kind of solution that could be injected into the body, was simply amazing. Of course, right now, you were hoping for the solution that would change you back into a normal girl, sometime tonight, since school began again tomorrow. And another week of school as a girl, among the girls, would find you wiser in their ways.

    Somewhere in the back of your mind was something that nagged at you, that you really couldn't put your finger on. If you could put your finger on it, you'd find a part of yourself that feared the prospect of finding life as a girl too much of a good thing.

    You have spent the last four school weeks as a girl, and you have come a long way in both understanding and communicating with the fairer sex. Your brother was happy to hear about the results of your voluntary experiences but, much to your frustration, he wouldn't allow you to go to school as a catgirl.

    While you have been a girl during the weekdays, you have spent your weekends as a catgirl. You weren't sure about what you found appealing about adding a tail and a new pair of ears to your female body, but you felt that you had to explore it, much like you have with the pure-human body that you have used in public.

    Your intuition, as far as you can see it as being, tells you that your brother is starting to give in to your demand. It could have been as a result of pouncing all over him while wearing next to nothing, or it could have been due to the times that you had seemingly appeared and acted threatening in a feral-like manner; you were sure that he was breaking down either way.

    It was just a matter of waiting for him to give in. And you were good at waiting... Lying around and taking naps came naturally to you now, what with having nothing else to do, since you were stuck inside of the house. Your brother wouldn't let you show yourself to the public as a catgirl, but you were sure that he would change his mind soon enough. It felt good to luxuriate in a nice, soft, warm sleeping spot, but you really felt the need to "stretch out" your legs, so to speak.

    Your brother eventually gave in to your demands, and he was able to make the arrangements that would allow you to attend school as a catgirl. To put it simply, you were to be a subject of interest in a social setting study, in order to collect data on broader subjects.

    You attracted a lot of attention at school for the first few days, as expected. But the novelty wore off soon enough and you found yourself back into your usual routines, aside from a few exceptions.

    However, after spending two weeks as a catgirl, both in and out of school, you realized changes in your behavior. You had become more outgoing and sought attention, which culminated into goofing off and acting cute. As a result you paid less attention to lessons in class, and some of your teachers had approached you about your sudden drop in grades. And if not for them doing that, you wouldn't have realized the changes in your behavior.

    But you had to admit that you were having fun, now more than ever. Whatever reservations that you had with your girl friends were now gone, and you were really meshing with them. And while you were still careful about how you handled other guys, getting their attention had become more amusing than disgusting.

    In the end, becoming so carefree had been the best thing to ever happen to you.

    Of course, as with all good things, they had to come to an end; you just hadn't expected it to be in a way other than returning to your normal, male, completely-human self again.

    While you had known the dangers, and that extra, special security had been enlisted to the school for your protection, people interested in your brother's work were still able to kidnap you. The family of one of your friends had been threatened by the organization responsible for your kidnapping, so, when she had offered you a ride home (and not for the first time), she had taken you to a location of their choosing, instead.

    And from there you were taken to a secret facility in another country, where you had to endure months of humiliating and painful tests and experiments. You hoped that your brother, or anyone, would come to save you, but...

    Once they had learned everything that they had wanted to know from your body, you had been made a trophy of sorts, as well as a pet, but, overall, a prisoner. From time to time you'd be handed over to a new owner, no doubt because your location had been compromised. It seemed that you were kept alive to add insult to injury. At least that seemed to be the case, at first.

    But things changed over the course of two-hundred years, as things tend to do. After a while you were simply kept by the same family, and over time you noticed that they no longer knew of your origins. As for your brother, and what became of him, you never knew.

    At least were you being treated differently these days, a lot better, although you were still a prisoner, never allowed to leave the mansion. That, and the reason for the treatment didn't suggest that things were going well in the world that you had been denied for so long. And if you weren't overhearing their whispers, people were now beginning to openly refer to you as "The First One", "The Perfect One", and even "The Untainted One."

    It seemed that something had gone horribly wrong in the world, and they had searched for, and found, you. They respected you, and treated you well, but they didn't want to risk letting you go, as if they had great expectations of you. But all that you wanted to do was be alone. What business did you have with a world that you had been denied for two-hundred years?

    And, more importantly, when will they allow you to close your eyes for the last time?