"Give me the Double-D Guarantee!"

John concentrated, and then snapped her fingers, and watched Melanie's modest bosom grow right before her eyes. In the span of only a few seconds, they grew from tiny A-cup mounds to massive DD mammaries, straining against her top somewhere between C and D until the straps of her top snapped right off, causing them to jump right out of her top and into the open air, her nipples stiffening from the air-conditioned environment of the Doe residence's bathroom.

"Holy. Fuck," Melanie marveled at her new breasts. Her eyes were bugging out of her head and John was certain that her jaw would've hit the floor if her massive tits weren't already doing a good job of catching it for her. "They're...heavier than I was expecting," Melanie admitted. John tried to hold it in, she really did, but once she snorted, the laughter was inevitable. Large, loud chortling that rocked her body and caused her to double over it hurt so much.

"Sorry, sorry," John apologized when she could breathe again, "Just. That reaction."

Melanie stood quietly, arms crossed over her massive chest. She was trying to look mad, but the thin line of her mouth trying not to curl up into a smile betrayed her. Eventually, their eyes met and they both giggled like mad women.

"Okay," Melanie said after the second laughing fit was over, "But what am I going to wear? I can't walk around topless and my clothes won't fit me like this and...I liked this top, dammit!"

"You can get a new one," John replied, "And last I checked, toplessness was legal in this state."

"Yeah, out in public!" Melanie punched her sister, "I have to go to school! You know, the place where they have a dress code?!"

"Can you keep them at least long enough to help convince everyone else?" John asked, "It'd be easier to convince them who and what I am now if you showed up to breakfast like this."

"Showing my tits to mom and dad? Gross!"

"Oh, like no one in this family never seen tits before!"

Melanie opened her mouth to argue further, thought better of it, and closed her mouth again. Then she looked pensive, "Could you change people's minds? Like their opinions and personalities?"

"Y'know," John mused, "I haven't tried it yet."

"Let's try it! Make me so I'm not self-conscious about my chest!"

"You sure?" John warned, "This is much more different than just giving you bigger boobs."

"I know," Melanie looked determined, "It's something I want anyways. I mean, what's the point of having huge knockers if I can't show them off?"

"Okay…," John said and snapped her fingers.