There is a camp where families go on vacation. From the outside it looks like a completely normal camp, cabins, activity centers. But what people don't know is that this camp changes people.
You could go in being a complete nerd with your face covered in pimples and no muscle to speak of. And then come out being a sex symbol. Depending on which way people choose to look at it this is a good thing. In other cases not so much
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Anything could happen. You could become younger, you could become older, uglier, sexier, bustier. You could change gender, you could become an animal, you could even cease to exist.
No one realised this was happening of course they all thought it was normal. One family went in. A mother, a father both aged 40 with their twin girls aged 14. The girls weren't anything special to look at they just existed. By the time the vacation had finished one of the twins was pregnant with the other at age 24 with two boys who had been her parents at age 2.
A new family had arrived.