Kelly is a girl who has the ability to create copies of herself. Her special ability first manifested when she was 15 years old.
This happened during her summer vacation, while she was at summer camp having fun with some friends near the lake. Kelly was a hyperactive girl and always wanted to do more than one different thing, and even though she was with her friends at the lake and didn't want to leave their side, she also wanted to participate in a volleyball gamem that one group was playing in the other side of the camp at the same time.
A lifeguard had to intervene and, when she was removed from the water, both she, the lifeguard and the others watching the scene were surprised to find that there were two Kellys inside a single swimsuit, which was slowly giving up to the pressure inside of it.
Both Kellys were given clothes to dress individually and were sent to be examined in the infirmary, where they confirmed that both girls were the same Kelly, having all the memories and knowledge up to the time of their splitting, the nurse on duty, after examining them, came to the conclusion that it was almost certain that she had awakened her special power, which allowed her to accidentally create a copy of herself.
At night, in the dorm, both Kellys were in their pajamas as they and their friends talked excitedly about the power she had awakened. Unaware of the full extent of her abilities and how it worked, the girls asked if she could make more copies of herself. The Kellys tried to divide themselves by remembering the feeling from before and trying to replicate it. It worked, but only one of the Kellys split into two, adding a third Kelly to the group. They came to the conclusion that only the original Kelly was capable of producing clones while the clones did not have the same ability. With two Kellys in the same pajamas, it was also clear that she could only duplicate her own body and nothing else. The biggest problem in this situation was that the copy was so perfect that not even the Kellys who had just split could tell which of the two was the original and which was the clone.
In the following days, Kelly decided that it was better not to use her new power until she understood better, because if there were too many of her it would be complicated. Despite the resolution the development in her discovery came just three days later when the clone Kellys turned pale and, within minutes, they 'died'. With the 'deaths', Kelly created two more clones, with which she discovered a limitation in her ability. The clones were perfect copies that could live a normal life as long as they existed, but had a life expectancy of only three days, during which they turned pale shortly before the end, disappearing as they became smoke just an hour later, always leaving their clothes and anything that was with them where they were at the time. Kelly, at first, felt bad about seeing her copies disappear, but over time she got used to it. The clones also seemed not to care about their short lives or knowing when their end would be, and when they reached their final moments, they usually felt fulfilled for having been useful to the original. They also did not feel that their lives were short, as the memories they inherited from the original Kelly gave them the feeling that they had lived for years.
A few months after awakening her power, Kelly discovered that she could connect her senses to her clone's, seeing, hearing and feeling everything that the other her, a privilege that only the original Kelly had over her clones. Having mastered this, Kelly began using her clones to not only do her homework faster, but to advance in her studies, getting perfect grades in all the tests she took.
Over a years with her special power, Kelly learned how to create clones using just one part of her body, making it more practical since she needed to take off all her clothes to do so, not to mention that she eventually discovered that she could produce changes in her clones. The discovery happened when she was already 18 years old, because she masturbated thinking about an actor of a movie she just watched, so she created a clone to have sex with, which she considered just masturbation because it was technically with herself, but what came out was someone who would had her own mind, but the body was that of the guy she imagined. With her consciousness connected, Kelly had her virginity taken by a male clone of her. She couldn't wait to tell her friends.