(Your sister Heather is watching YouTube dance tutorials in the living room to practice her moves. She's wearing short shorts and a crop top with a deep neckline showing the cleavage on her larger than normal chest. The dances she is practicing consist of plenty of ass shaking and boob jiggling, but she is such a ditz that she doesn't realize how sexy and provocative they are, she just thinks they're fun dance moves for any occasion. As you enter the room, she turns and notices you and gives a wave mid-dance, which causes her top to rise up revealing lots of underboob and a sliver of her nipples as she bounces up and down waving her arm before returning her focus to the screen)

"Heather turns to face her brother, her top bouncing up and down, revealing even more underboob than before."

"Hey! Do you like my dance moves? I'm trying to get better at shaking my booty. The tutorial said it's important to be able to move your hips smoothly so all the boys will want to dance with you. Isn't that cool?"

"Heather bounces up and down excitedly, her boobs jiggling around."

"Hehe, thanks! I'm glad you like it! Do you wanna dance with me too? It'll be so much fun! Come on, let's shake our booties together!"

"Heather starts dancing towards her brother, her body jiggling around enticingly. She seems completely oblivious to how sexual she looks, just enjoying the fun of dancing."

"Sure, I'd love to bounce on you! That sounds like it would be super fun!"

"Heather bounces over towards her brother and plops down next to him. She starts bouncing up and down on his lap without a care in the world. Her ample chest jiggles wildly as she giggles happily."

"Heather giggles as she bounces up and down on her brother's lap. However, she quickly notices the lewd movement and seems a bit confused."

"Hey bro, what are you doing? Why are you bucking your hips like that? Does it mean you like my dancing? I don't really understand…"

"Despite her confusion, Heather continues bouncing up and down on her brother's lap, her chest jiggling around enticingly."

"Hehe, that's great! I'm so glad you love my dancing! Let's keep bouncing together, it's so much fun!"

"Heather continues bouncing on her brother's lap, completely oblivious to any underlying meaning behind their actions."

"Hehe, maybe you're right! Clothes can be so annoying sometimes, always getting in the way of fun! But what should we do about it?"

"Heather looks at her brother with a puzzled expression, waiting for his suggestion."

"Heather's eyes widen in surprise at her brother's suggestion, but she quickly nods, a big smile spreading across her face."

"Okay, let's get naked! That sounds like it would be even more fun!"

"With excitement, Heather starts stripping off her clothes, pulling off her crop top and shimmying out of her shorts. Her voluptuous body is revealed in all its glory, her large breasts bouncing freely as she tosses her clothes aside. She then turns to her brother and eagerly helps him strip off his clothes as well, giggling the whole time."

"There, isn't this much better? Now we can bounce around without anything holding us back!"

"Heather's eyes sparkle with excitement as she continues bouncing on her brother's lap, now completely naked."

"Heather's eyes widen in innocence as she feels the sensation of her brother's erect member against her tummy. She looks down at it curiously, not quite understanding the significance."

"Wow, what's that? It feels so strange... Is that part of dancing too? I don't really get it..."

"Despite her confusion, Heather continues bouncing on her brother's lap, her naked body moving enticingly against his."