The Weasley twins sat on the window sill near the charms classroom. They were surrounded by a mess of ingredients and colorful paper, all part of their latest experiment. "George, I think we may have finally perfected our ultimate firecracker," said Fred.
"Fred, I think you may be right," responded his brother. "There is only one way to find out." He held up the brightly colored firecracker, offering one end to Fred. They tugged on it, and there was a tremendous explosion. Red and green smoke surrounded the twins. If it had worked right, the corridor should be filled with Christmas decorations.
As the smoke cleared, Fred and George saw no decorations. The tan stone of the castle still met their eyes. Except something was not quite right. It didn't look like they were sitting on the window sill anymore. In fact, the twins could not quite recognize where in the castle they were. Voices echoed in the corridor. A moment later, two giant figures of Hogwarts students passed by the stop they stood. It took a minute for them to process what had just happened. "Dude, I think we just shrunk," exclaimed George. He realized they were standing on the window sill. All of their supplies for the firecrackers had vanished.
"Cool," Fred said excitedly. The twins had considered developing a shrinking potion to include in the joke shop they wanted to open. It would be a way for kids to sneak places they should not be. Or someone could shrink their annoying sibling and keep them in their pocket for a few hours.
Fred and George watched as a gaggle of Beauxbaton girls walked past, marveling at their gigantic size. From where the twins stood on the window sill, they got a great view of the girl's skirt-clad butts, which looked to be the size of billboards. George whistled. "I would not mind being the plaything of one of them."
Giant students continued to walk by, unaware of the inch-tall twins. Fred and George just watched, not yet considering how they would get back to normal size. Just then, Ginny came into view. She had her nose buried in a Quidditch magazine. They called up to her, but their voices were too small, and she was too absorbed in the magazine. To their horror, Ginny started to sit down. They did not have time to get out of the way and were sandwiched under her butt. George was pinned in an awkward angle while Fred's face was squished into the black fabric of Ginny's skirt. Luckily for them, the weight of their giant sister did not seem to hurt them at all.
Feeling something underneath her butt, Ginny stood up and swiped the boys to the side with her giant hands. Her eyes widened in surprise as she saw her tiny twin brothers. Ginny scooped them into her hands, bringing them to eye level for examination. "Fred? George?" she asked in astonishment.
Fred nodded with a smile. "The one and only that you flattened with your backside."
Ginny smirked. "Serves you right for all those pranks you have played on me. So what happened to you two?" They explain their experiments and how something went wrong. "Well, I actually you better this way. You are so cute and little." She poked them both in the belly. Ginny liked the idea of having her tiny brothers as pets.
"It is pretty cool having a giant sister," said George. "Though if the effects don't wear off soon, you may have to take us to Madam Pomphrey."
"Don't be such a worrywart," cooed Ginny. "I will keep you with me for now. We can see how you are doing tomorrow." Before the boys could protest, she closed her fist around them and started to walk away. Ginny's skin was soft, warm, and smelled like flowers. Fred and George had no idea where she was going. They could just hear the should of her feet echoing on the floor and feel the motion of her arm swing as she walked.
A few minutes later, Ginny arrived at the Portrait of the Fat Lady. "Pumpkin Pastises," she said to be admitted into the Gryffindor common room. It was empty, so she opened her hand and looked down at the tiny twins. "I have to get some studying done. In the meantime, I need to keep you hidden. I don't want anyone else seeing you." Ginny quite liked the feeling of her tiny brothers under her butt, so she dropped them…