"I want to party!" Sally exclaimed. "So, I should be at least old enough to drink. I want to be 21!"
"Are you sure that's a good idea?" Jason was a little worried.
"Yeah! That's what I've decided, and you did promise that I got to pick whatever I wanted."
"I did, but you still have to be careful."
"Yeah, yeah, I will," Sally shrugged. "It's time to change."
Sally concentrated on the age she wanted, letting the room do its thing.
She'd already entered puberty, but now it was starting to take full effect. Her breasts grew, and her tank top changed to accommodate her new chest. Her hair grew longer, from a bob to a long mane of hair. It also darkened, from a light brown to a dark brown.
She posed in the mirror as the changes finished up. She was ecstatic about her new look, but then she noticed something, something that hadn't changed that much.
"Why am I not taller?" she pouted.
"I think you're a bit taller," Jason said.
She went up to her dad and compared heights. "Dad, I can barely reach your chest!"
"I am a man. You're about normal height for women. Just a little bit below the average."
"Below the average? I was the second tallest in my class, I should be a tall adult too!"
"Some people stop growing early."
"I guess. It's not the worst I guess. I did end up pretty, and that's what's important."
Jason agreed. She'd have no problem attracting boys, and that worried Jason somewhat. Though, he'd worry about that tomorrow. It was getting late, and he was getting rather sleepy.
Jason went to bed, and so did Sally some time later after she was satisfied with checking herself out.
…
Jason woke up first. He looked to the side towards Sally's bed. She was still asleep, sprawled naked on the bed, her adult body on full display. He looked away. His daughter suddenly being an adult was… weird to say the least.
Jason freshened up a little in the bathroom, and when he returned, he saw that Sally was awake, she'd also gotten dressed, thank god.
"I am planning on going to the beach," Sally smiled. She was dressed for the beach, wearing a summer dress with a bikini underneath.
"Can I join you?" Jason asked.
"Dad," she started. "You can come, but I don't want you watching over me or anything. The room doesn't just change how you look. It changes your mental maturity too, so I'm much more mature than a 12 year old."
"I'll try."
"Also Dad, you should change already. Be younger, then we can hang out, and it won't be that weird."
"How old should I be?"
"You could be 21 too, or something around that, I don't know." She picked up a brochure from the table. "Look here, it mentions relationships, you can't be my dad if we're the same age, but you can be my brother, or we could just be friends."
Jason decided he'd want to keep the family connection to Sally and be her brother. He still wanted to be a few years older, so he settled on 25. He focused and the changes started.
There weren't drastic changes, but a lot of subtle ones. He slimmed down a bit and regained some muscle as he reentered his prime. His hair became thicker, and he regained the luscious locks of his youth. He felt great, fresher and full of energy.
"Nice Da-," Sally stopped herself. "Nice Bro. You're looking great"
"Thanks. I feel great."
Jason found his swimsuit, and soon after, the now brother sister pair were walking to the beach.
"Do you think we might look like a couple?" Sally asked
"No, I hope not." Jason replied. "Why are you worried about that?"
"Well, we don't look too similar, and then it's not impossible to think we might not be not related, and then they might think we're a couple, and then boys might not approach me."
Jason wouldn't mind if he had that effect, but he understood that Sally wanted her fun, and that it would be hard to stop her. He hoped that she'd gone far enough with the mental adjustments so she'd be mature enough to handle herself. Himself, he'd opted with very mild adjustments. It's not like he didn't know how to be a 25 year old, so he had gone with the bare minimum.
Just as they arrived at the beach, Sally suggested something. "How about we split up?" We'll meet up later, alright?" And before Jason had much of a chance of protesting, Sally was waving and running away.
Jason sighed. He didn't bother chasing after her, he'd let her do what she wanted, but even then he still thought of her as his 12 year old daughter. Maybe he should have gone harder with the mental changes, that would have made things easier.
Jason decided he'd spend his time how he wanted to. It was a vacation after all, and here he was, on the beach with a bunch of people around, sunny weather, and a lively atmosphere.