"Hi!" A brunette little boy no older than 4 years old in a green bathing suit said to Jack. "Are you alone?"
"Yes, I am." Jack replied trying to ignore him while he thought where to go.
"Me too. I'm Mark" He replied. "How much have you regressed? 10? 15?"
"I haven't." Jack said. "I'm in my real age."
"Oh, come on." Mark said. "Are you telling me that you, a teenager, came alone to this expensive hotel completely alone?"
"Yep." Jack replied. "And, if you excuse, I think I'm going to those water slides."
Jack left Mark as he went toward the big water slides where a lot of teen were going. He was avoiding to touch the water and change his age accidentally because he wanted that his first experience was especial and he thought that the water slides could be perfect for that.
After walking a while and when he was near to a snack bar, he was suddenly hit by a big water balloon that wet him from head to toe.
"Shit!" Jack cursed as he tried to dry himself with a towel. Quickly he realized it was useless and just begged to don't regress to a baby. He closed his eyes as an intense tickling moved through his body.
When he opened his eyes again he looked downward but instead of the baby feet he was expecting to see, he saw a pair of hairy manly feet bigger than before and that wasn't all! His legs, his belly and even his arms had grown as well, they looked meaty and quite hairy. He had definitely changed, but instead of getting younger he had got older.
He touched his face and felt a thick stubble covering his jaw, he moved his hands down and fingered the rug that covered his chest. He kept moving downward through his treasure trail until he reached the thing he was most curious about, his dick.
First thing that he noticed is that his clothes had changed to sill fit him, however they weren't swim trunks anymore but a tight and very seductive speedo that showed off how much he had changed in there. A big bulge, not obscene but still quite impressive, was proudly hanging between his manly legs while a as impressive bubble butt did the same on the back.
"That must be your real age!" A brunette young man in a green speedo told him as he got closer to him.
"Mark?!" Jack said and immediately stopped when he heard his deeper voice for the first time. The young man who was as tall as him just grinned and patted him on the back.