Well to make things go quicker, I'll skip past all the oring stuff, and get right to the action.1
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"Wow, this big!" Ron said, spacing his hands across his chest and leaving a two and a half foot space between. "Yeah." Fred and George simultaneously. That day after class, when Ron snuck into the girl's bathroom again with Harry's invisibility cloak, he did it. He pulled out his wand and made a swift motion with his hands, "Magnus Mastia!" he shouted. The girls looked around for who had uttered the spell, but to find nothing. That night, as Hermione was tucking in to bed, she felt a piercing feeling in her chest the made her vomit.3
She tore open her night gown to find her breasts pulsating with her powerful heartbeats, her arteries almost popping through her skin. At the same moment, she looked around the room, to find all the other girls to have her condition. The pain peaked, the teens sprawling across their beds, their chests forcing forward. They screamed, and fell unconscious at once. 4
That morning Harry and Ron sat alone at breakfast, along with every other boy, not a single girl to be seen in the Great Hall. Later that day, Hermione showed up at their classes, but with a noticeable enhancement; her puny A cup tits were now wholesome D's! The other girls showed improvement as well, and by the end of the week, every girl at Hogwarts was bestowed with G cups. Soon the boys were overcome with lust, and by the end of the next week, even Luna Lovegood was pregnant!5
Within a month, the bellies of every young witch at the school had reached the size of a beachball, and their boobs were about the same. Soon the guys became so desperate that Ron cracked, and gave up the secret of the spell, and within a month, Hermione's busts had reached ZZ cups, and her belly was like an Xtra large exercise ball. By Christmas, Hermione's breasts had nearly tripled in size, and her baby bump was nearing the size of a small car. The babies arrived in spring, with each girl giving birth the seventeen on average. Soon after, Hermione's nipples alone were as large as truck tires.6
By now even the ten year olds at Hogwarts were gifted F cup titties, and soon after they too became pregnant. Now Hermione had begun to fatten, and by the next year she had gain a total of 572 pounds. By her late twenties she weighed about 890000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000pounds, but only approximately, as I don't feel like giving the exact numbers. Then when Harry married Ginny, he made sure she had PP cup busts, and also prevented their having more than 10000 children, each of whom he bestowed massive boobies, and for the boys, the biggest dicks any chick could hope for.7
The End
