Effie stared at the coin. In all the stories she's heard, there was always a limit, or some sort of condition. Like with the genie in the lamp! He could only grant 3 wishes, and he couldn't make people fall in love. She pocketed the coin in the slip in her dress, and nodded. That way she wouldn't waste any of her wishes.
Soon, the two had arrived at the ice cream parlor. Olive held her hand as she stared at all the many ice cream flavors in the window, in all the colors she could think of. Of course, she had to go with the rainbow sherbet flavor - it was bright pink and had rainbows and sprinkles, how could she not choose it? The nice man behind the counter handed it to her in a little cup with a pink plastic spoon and pink umbrella to match. It was her favorite color, after all.
As they walked out of the store, Effie looked up at her mother. Olive was holding a cone much larger than her cup, with not one but two scoops of ice cream! Effie stopped walking.
"Why do you get two scoops and I only get one?" she whined.
Olive patted her head. "Because I'm a big, grown-up girl. When you grow up, you can have all the ice cream you want as well."
"When will I be grown up?"
She laughed. "Oh, not for a while. But you get to have ice cream with sprinkles and umbrellas! Grown-ups don't get to have that."
Effie's eyes narrowed as she weighed up the options in her mind. On one hand, sprinkles, umbrellas and other pink things. On the other, the ability to have two scoops of ice cream, ride on roller coasters, and do all the other things grown-ups did, like drive cars and watch big people movies. The choice was difficult, but she knew what she had to do. She reached her hand down into her pocket and grabbed the coin. "I wish that I was big and grown-up."
She felt her body stretching, growing taller and taller every second, growing to her mother's height of 5'6 and then surpassing it. The once diminutive 4-year-old stood at a height of 6'2, a whole half a foot taller than the most grown-up grown-up she knew. But, she wasn't done there. She had wished to be a big grown-up after all. Her body began to bloat with fat and muscle, giving her thick thighs and massive hips. Two swollen mounds of fat hung off her chest, perky E-cup tits with puffy areolas and nipples that protruded through her now much larger sundress. Behind the spaghetti straps, ample sideboob spilled out. She hadn't been wearing a bra before, so why would she be wearing one now?
Of course, she wasn't all fat. Beneath her impressive hourglass figure, hard muscles were rising to the surface. Her arms went from soft, to toned, to muscular, the thick fibrous flesh creating chiseled shapes. Any sag in her breasts was eliminated as cushions of pecs burst into existence, and below a hard six-pack grew into existence, deep groves between each well-defined muscle. Her arms were large and swollen with power, and her back was made up of two massive wings of muscle. Her plump behind became two perfectly spherical mounds of muscle, straining tight against her dress so the whole world could see each twitch of her glorious ass. To any onlooker, Effie looked like an amateur bodybuilder - muscular enough to be intimidating by her strength, yet with enough fat to look wondrously feminine, a true bombshell by any measure.
Yet, despite her physical maturity, Effie's mind still stayed the same. She was still a four-year-old girl, still Olive's daughter, despite being trapped in a body twice the woman her mother was. And, most importantly, her ice cream was still a single scoop with sprinkles and an umbrella.