Dan took to magic easily and impressed both Kat and Grandma. While there, he recalled memories of two years that never happened. Grandma explained that his age had shifted when their souls were bound. He really was 18 years old, just like his sister. Whatever sort of education and mental growth she had in the last two years was shared with him while they were joined. They would even be attending the same classes as seniors come Monday. Dan was happy that he didn’t need to endure another two years of high school. The transition also helped to explain why he and Kat were suddenly getting along like old friends.
The two of them continued their magic practice until late evening. It wasn’t dark just yet, but they knew that their parents wanted them home. They said goodbye and thanked their Grandma before leaving. The moment they stepped out of the house, Kat’s skirt vanished and Dan was fully naked again. They laughed as they got into the car. They didn’t have anything to put on, and opted to let the earlier spell conceal them until they were home to do something about it.
Dan couldn't help looking at his sister's naked bottom every so often. Related or not, it wasn't typical for a girl to be bottomless all the time. Kat noticed but didn't give him any grief for it. They had spent enough time conjoined that it really didn't bother her. She was guilty of sneaking peeks as well, but felt bad since it was her fault that he was nude in the first place.
Once home, Dan was happy to be addressed as an individual by his Mom and Dad. The only thing that made it unusual was that he was still naked. Fortunately they were completely oblivious to it. Dan spent the rest of his evening reading his spell book and testing out some of the new spells he had learned.
He managed to reverse the spell that made it OK for him to be naked... Sort of. He found a way to make it so he could go either way. With that, he could be naked in public without drawing any attention, but still had the option to put something on. After the spell, he put on some shorts and a t-shirt, then went to relax in the living room. He met his sister on the way. She was still walking around without pants and he asked if she planned to do something about it.
Kat shrugged. “Eh... Maybe eventually... It’s not causing me trouble, so I wasn’t really worried about it.”
“I see you’ve dressed up. Do you suppose our parents will say anything?”
He chatted with her for a while, first about the method he used to fix that spell, then about her chest. In his reading he found something that might be able to reverse it. Kat seemed indifferent to removing her new assets and said he could give it a try if he wanted to, but not that night. She had her fill of magic for the day and decided to shower and head to bed early. Dan didn’t mind waiting, he could take the time to do more studying.
He spent some time watching TV in the living room, then went to take a quick shower. The air was still warm and foggy. He guessed that Kat had only just finished. He lathered on some soap and stood under the water. He would have taken a longer shower but had trouble keeping his eyes opened. He decided to finish, dried off, then went back to his room without bothering to put anything on. He was exhausted. The day had finally caught up to him and he was ready for sleep. He collapsed on his bed and dozed off...