Bored Little Girl/Older sister
You decide to see what your older sister, Jackie is up to. Jackie is three years older than you, currently a bubbly 12-year-old. Though her budding sexuality was beginning to show in a pair of subtle mounds on her chest, she still tended to act like a little kid and didn't bully you or take advantage of you just because she was older and bigger.
As you enter the door to Jackie's room, you see her seated on her floor with her phone in her hands, facing away from you. Some crappy boy band is playing on her wireless speaker, but quietly enough that she can hear you enter. She turns her head and smiles brightly when she sees you. "Hey, girl!" she says in a slightly singsong voice. Then she pats the floor beside her, beckoning you to sit next to her. You oblige, grabbing one of the many colorful pillows strewn about her floor to sit on.
"Whatcha watching?" you ask.
"Just dumb videos. Check out this one, these girls do this crazy jumprope routine!"
She pulls up a video of a trio of teenage girls continually jumping rope while doing tricks and switching positions. The choreography would certainly be impressive, but you find it hard to focus on that when you notice the jumping is causing these girls' ample breasts to bounce rhythmically. Their light T-shirts did little to hide this, even flipping up high enough to briefly expose their bras during their most athletic movements. As you fantasize what the teens' boobs would look like bouncing in just their bras, and then totally unclothed, you feel your panties moisten.
Too soon, the video is over. You realize from a heat in your face that you're probably blushing, and stutter out "Y- yeah, that was really cool!" in an effort to react normally, and not as though you had just been imagining girls twice your age jumping around half-naked.
"Right? I wish I could do stuff like that. But I just don't have the timing. I can't even dance, look!" said Jackie, excitedly jumping up and dancing awkwardly to the obnoxious electronic song that had just come on.
You adjust your position of the floor to get a better look at your older sister, turning and laying back on another fluffy pillow. As your sister spins in her dance, you quickly glance down at your crotch and see some of your pussy juice has leaked through your panties, making a small dark spot on your shorts. You pull your legs together and quickly fold them in front of you to hide your excitement from your sister, who seems more focused on her silly dancing. As she bounced innocently up and down, her pink dress kept flowing up and exposing her plain white panties, which did nothing to stop the wetness that continued to leak out of you and soak your clothes. You want nothing more than to throw off all your clothes and masturbate furiously on your sister's floor, but you decide instead to try getting off in a way that wouldn't totally freak her out.
"Hey," you begin as your sister plops back down on a pillow beside you, exhausted from her enthusiastic dance.