Keith stared lustily at his girlfriend as she set the dessert in front of him. Elle wasn’t much of a dessert person, so she had only bought one cupcake from a bakery a few blocks from her apartment. She had placed one candle in the frosting and lit it before she gave her boyfriend the sweet. “Happy birthday, hun. Make a wish!” Elle said, smiling. Keith smiled back at her, a little buzzed from his first legal drinks that night. Thinking about his wish, Elle was stuck in his mind’s eye. Keith thought about her figure in the tight black dress she was wearing. It was nothing to be ashamed of, with curves in the right places: full, wide hips with a plump rear, long legs, a thin waist, and eye-catching D cups. Impulsively, he made his wish. I wish that Elle had super exaggerated curves and… he noticed the glass of milk she’d poured to go along with his dessert. And her tits were full of milk… He easily blew out the candle.

Suddenly, Elle’s breasts surged with growth, swelling bigger than her head in a few seconds, splitting the top of her dress in two. Elle sharply gasped with the intense sensation. She apparently had not been wearing a bra since her tits were now fully visible as the material of the dress was pushed away by her swelling boobs. “What’s hap… happening… to me?” Keith didn’t answer; he was fully enraptured watching her tits grow.

Elle’s breasts grew quickly, rapidly becoming more and more massive. Her dress ripped down to her navel as they grew, her boobs now swelling over the fabric of her dress. Elle’s attention was momentarily drawn away from her chest as she felt the lower hem of her dress start to rip. Her hands flew down to her ass to discover a plumping butt and widening hips. The fabric ripped and rode up on her as she grew curvier, exposing more of her as she grew. "Keith... hun... why are my boobs and my ass growing..." she asked, her voice a little breathy from the pleasure of the growth. "Oh, my boobs are so... full..." Elle now wore an expression of great pleasure on her face.

The tears in her dress lengthened with every passing second as Elle's body plumped and grew. If she got much bigger, the dress would rip in two. Elle brought her hands back to her still-swelling volleyball sized tits, teasing her bigger nipples with her fingers. She felt her hands get wet and tried to look down all the way to see her growing teats. It was clear to her she was lactating. "My tits... are full of milk?" Her growth quickened with her expression of milk, Elle's breasts surging past her belly button. Her burgeoning boobs were nearly a foot thick at this point, and wider than her shoulders. Not wider than her hips, though, which had continued to expand. To say Elle had child bearing hips now was an understatement. They were now almost two feet wide, supported by thickening thighs and a plump bubble butt that stuck out noticeably behind her.

The rips in her dress continued to grow, the tears from her boobs and her butt finally meeting. The dress split in half, revealing fully her exaggerated figure. As Keith watched, mesmerized, Elle's tits were still growing even after her hips had stopped, pushing past basketball sized. Elle was still milking herself, the thick white liquid flowing smoothly from her sensitive and thick nipples. The milk pooled on the floor around her and soaked into her now useless dress. Her breasts still grew, filling with more milk and more flesh. Soon, they grew too large for Elle to reach her nipples, although she continued to lactate even without any stimulation. Her boobs grew past her hips, now covering her entire torso. The growth, still visible, was beginning to slow, finally.

Her face relaxed as the growth stopped. Elle's milky tits obscured her from chest to mid-thigh. Keith and Elle both observed her post-growth figure; Elle spun slowly and contorted her body as she tried to see everything. Her ass had gotten huge, growing larger than nearly any other woman's, each cheek now a foot wide. Her hips and thighs had grown to match, her thick thighs now leaving no gap between them. The main attraction, however, was her enormously swelled breasts. The beach ball sized tits were two feet wide and a little less thick, making her leaky nipples project too far for her to reach them. The pink nubs now resembled bottle caps as her milk still flowed slowly through them. Elle's gaze fell upon Keith again.

"Hun," she said, very calm. "Why do I look like a fertility goddess?"

"I... uh..." he stammered, eyes locked on her nipples.

"It wouldn't be because you made an impulsive wish on the cupcake I bought you, would it? The magic cupcake that I had specially made for you?"

"Babe," he said, looking into her eyes now. "How was I supposed to know that you got me something that would grant me a wish?"

Her face softened. She knew he was right. She sighed, and smiled. "You're right, hun, but you're still gonna have to make this-" she gestured to get extreme curves- "up to me."

Keith looked at her inquisitively.

Her expression changed to snark. "You're gonna join me in my bedroom and you're gonna fuck me better than you've ever fucked me before, hun." She turned and sauntered towards her bedroom, her exaggerated curves wobbling with each step. Keith was up and undressing in seconds. Following her, he saw her standing with her hands on her hips. She tossed a condom at him. Putting it on, she pushed him onto his back on her bed.

Straddling him, she smiled. "Happy birthday," she said as she lowered herself onto his cock. "Ooohhhh, everything feels better now, you really went all out on this wish, huh?" She bounced up and down on him, her huge boobs bouncing a little out of time. Elle cried out when Keith latched onto a nipple and began to suck, her milk starting to flow quickly. "Oh fuck, that's good, I'm gonna, I'm gonna..."

Elle shuddered as she came the first time, trying her hardest to keep her up and down motion going. She lost any sense of control when the second orgasm struck, now spasming on Keith's dick. Her pleasure melted into one continuous orgasm as Keith nursed milk from her. Elle lost track of time but was dimly aware of Keith finishing. She regained her senses as he released her nipple.

She looked down at him. "I think I can get used to these tits, honey," she said, grinning from ear to ear. "At least until next year."