You got the idea of your wish merely by looking at the genie in front of you. A girl who has extraordinarily good looks and a figure to die for. You wouldn't mind having a girlfriend like that! She's got round, firm and bouncing buttocks underneath her veils and her boobs look perk and all firmness. Small but as luscious as little apples. Like her lips, that are plump and a real magnet. She got curves and not an ounce of unsavory fat. Her locks are dark and curly in a wonderful way and her eyes are big and sparkly. Yes, she's very, very attractive and amazingly exotic. She transpires oriental sensuality. So you immediately knew what you wanted as your first wish.
"I want a girl that looks exactly like you, genie. You are gorgeous and I want a girl with your exact same looks. That is my wish," you said, certain of your good idea.
How wrong you were. The genie smiled.
"As you wish, master!"
You expected a girl looking like the genie to appear and start making love to you. Instead, you watched as you chest expanded and you fingers got daintier and longer. Your bones got thin and your muscles melted. Your clothes, shores, and socks were now too small and you felt your face become numb as the delicate bones shifted. Your jaw thinned, your lips gathered more fat and your eyes widened dramatically. Your hair darkened and fell like a cascade on your back. Frightened to the extreme, you stared inside your boxers and got the confirmation of your horrific expectations. Your testicles, which used to make gametes, got swallowed by the flesh of your groin. They travelled with a dull pain to both sides of your pelvis. They settled comfortably, never to be dislodged. Gamete-makers they stayed, but they were now the makers of female gametes, eggs. A uterus, womb and female genitalia were now in existence within you, with your penis retreating similarly and turning inside out, a painless yet very, very strange sensation to you.
"No! Make it stop! It's becoming smaller!" you screamed, appalled by your feminine voice and failing to keep the last remnants of your manhood with you.
Your penis just left behind its last remnants indeed, plump lips, a clitoris and a hairless crotch. Your skin got darker and smooth, last step in making you a human twin of the female genie that had attracted you so much.
"What... What have you done to me!??!" you screamed in a high-pitched and shrill voice.
"The magic thought that if you wanted a girl like me, the simplest way was to give you my body. You indeed have a girl like me, now. I let the magic loose, but it does what it wants. Hence results much different from what the wishers expect. But you have a girl like me, technically. So you must be happy! Enjoy until I come back!"
She vanished, still with her wide smile, and left you to deal with your new body.