Note: I remembered a joke that I heard 20+ years ago and although the wishes in the joke are the same I figured I'd make it into a short comedy story expanding on the joke some from the perspective of the other parties involved and turning it into a story. I'm not a professional author so please forgive any errors.
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Mark's hobby of using his metal detector on the beach was one of his favorite past times. He'd find coins, jewelry, and most of the time worthless stuff like bottle caps, He had just graduated high school and his GF broke up with him as she didn't want to stay together as they were planning on going to different colleges.
To make things worse he had found out she was cheating on him with a guy named Greg who always liked to bully him and is going to the same college as his ex-girlfriend. So he came out onto the beach to treasure hunt and clear his mind.
Surprisingly he had found something bigger than usual once his metal detector went off and he started digging with a small garden trowel. What came out was one of those old oil lamps and as he went to wipe it he noticed smoke coming out of it.
Mark quickly dropped the copper-looking lamp and tried to step back so fast he lost his balance falling onto his ass. With his jaw dropped he had to rub his eyes and even pinch himself to make sure he wasn't just dreaming and what he was seeing was real.
In front of him was a woman no older than he was. She had emerald eyes, bright red hair that can't be natural, and wearing mainly transparent type clothing he can't recognize. It hardly leaves anything to the imagination but covers all the important parts just enough to make it even sexier than if she were just nude.
She crossed her arms underneath her large double-D cup breasts pushing them up even more as she smiled at him, "Hello master, As you can tell I am a genie but not your average normal genie." After getting over his shock he just nodded, "Y-ya aren't all the genies I read about always males for some reason? I get three wishes right?"
She giggled causing her breasts to shake some before bending down and giving him a good eye full of them while replying, "Well there is that but that's not what makes me stand out. You see anything you wish for your enemy will also get your wish by double the amount. So if you wish for a million dollars he will get two million as an example."
It was very hard for Mark to concentrate on what she was saying as he couldn't get his eyes off her breasts that he found himself unconsciously fondling. For a horny 18-year-old teenager who hadn't had sex since he broke up with his ex, he was doing good holding it together this long. He had to stop himself from making a stupid and careless wish-wasting one before he asked, "So how many wishes do I get and what are the rules for these wishes?"