You ask him for the lamp, and he tells you that later, you tell him in a loud voice that he will give it to you now, he asks you, to tell him why you are so demanding, how special it is, in that, you see someone else take it away, she is your cousin telling him that it is a magic lamp.
You tell her that you are already bored of being a cat girl, that she return you to normality, she tells you that she does not want to waste her desire, the guy does not believe them, he wants to see his desire come true to believe.
So your cousin says she has an idea, she wants her last wish to be a combination of wishes from the 3, when they touch the lamp, you and the boy touch the lamp, you wishing they would come home, ceasing to be catgirls, and the lamp it gives a shine again.
When the shine goes away, you are relieved to be at home, but something is strange, your hair is still long, you look in the mirror, and you are still a girl, although you are no longer a catgirl, behind you, see a girl, she is your cousin, in your same age, you ask her what happened?, what she wish?, when you hear a small voice come out of her back, and then she shows you a small cat girl in his hands, asking them to return to normal, why this happened to him, you give yourself account that this minigirl is the boy on the beach, leaving your problem a little aside, seeing that it is worse, you ask again what happened.
Their wishes that they asked for, are counted, yours did work, but transported it to the guy more, your cousin's wish was that they stay as girls your age, and now you know why they are girls, you and the boy, and the desire of him was to have real cat-like features that you had, and if it worked turning him into a catgirl, but it also added the size, so he is a catgirl the size of a common cat.
You tell your cousin to give you the lamp to fix this, she replies that she got rid of this, seeing that she had the body she asked for and can no longer use the lamp she threw it out, but do not worry as they will now be cousins possibly roommates, who will take care of this cuteness together, while caressing the little cat girl
You listen angry, surprised at what she says, but feeling even more sorry for the boy who you suppose if you would have to raise and care for him together