You follow Teran down the stairs, silently contemplating a way to get everything back to normal. "It was all just meant to be a little joke, that's all," you think to yourself, "I hope she doesn't do anything stupid."
At the bottom of the stairs, Teran gets an idea for a prank of her own. She angles the size gun at you again and fires, growing you to a little more than four feet tall. She decides to grow herself too until she's almost as tall as the ceiling. You watch as she sneaks into the kitchen and aims the beam at your mother. "Okay, Jake, here's what I want you to do, and you'd better do it well..."
Your poor mother, standing at the sink, washing a bowl, suddenly clutched her head in dizziness. When she opened her eyes again, she felt like she was in a very different world. The kitchen sink was nearly as tall as she was; she was barely four feet in height. She felt confused, disoriented, small... To add to your mother's bemusement, you walk into the kitchen, seeming to be your normal size. Your sister had made an impressive performance in maintaining your height ratios so closely.
Knowing that your giantess sister is watching, you do your best to pretend that nothing was out of the ordinary this morning. You reach up high into the fridge to get yourself some milk, then sit down at the kitchen table. "Hi mum, what's for breakfast?" She stares for a moment, shakes her head, and finally serves you a large bowl of large cereal with a large slice of toast and jam. You begin eating, hurriedly, trying to satisfy your hunger before going any further with Teran's little joke. You manage to finish about a quarter of the bowl before nervously dropping the line you'd be instructed to say.
"Mom, Teran is wearing those tiny shorts that you told her to throw out, the ones that barely cover her hips."
Already frustrated in her seemingly overgrown kitchen, your mother is clearly peeved. She drops the dish she was trying to clean and yells toward the hallway, "Teran, get down here, right now." You bite your lip.
A moment later, you hear your mom gasp and see a look of horror on her face as your giantess sister steps into the room, smiling, and stretches out to toward the ceiling.