She is happy to spend time with someone she has not seen for a long time, although there is little she remembers, you moved a year and a half ago, she asks you questions, she wants to go outside and explore, you don't feel able to be with a little girl in the street, and you say no, that she plays in the house or watch TV.
You go to the bathroom and go back to your room and you see her playing with your things and the lamp, you tell her not to touch your things and leave, she says no, she wants to play outside with you, if possible in a beach or pool, she wants to be able to play more freely with someone her age, after this you see the lamp shine brightly
When you see, you feel your body wet, you look around and you are on a quiet beach, you see a cheerful preteen blonde girl, with ears and cat's tail, on the shore, with beach things and the magic lamp, you get up and go where she is but when you walk you feel weird, something smaller, heavier hair, your body more sensitive and soft, see your reflection and are surprised, you are a catgirl in swimsuit, the same age as the other, you go to the blonde and tell her :
Hey, cousin give me that lamp, or turn me back to normal
Mmm, hello cousin, how beautiful you are, this lamp fulfilled my wish, I don't think I gave it to you, she says
You try to grab her but she is faster, she also threatens to throw the lamp into the sea if you keep insisting, in the end you agree, spend the rest of the day like this, having fun, even while leaving the things in a safe place.
So they spend splashing in the water, close to your cousin, who has a very happy time, while you try to go along with she, which is a bit difficult for you, since you often blush when she treats you as a girl and how the other people too.