Hot Summer Job/You're always nice to your sister, and today is no exception
You raise an eyebrow and examine your sister with measured consideration, making this out to be some monumental act of mercy you're about to bestow.
"I dunno. Maybe if you do a different dare I'll let you out of this one."
She perks up a bit at that. "Sure! And then maybe I can dare you?"
"Maybe," you reply.
"Okay!" Bree postures up onto her knees, readying herself to spring into action. "So what do I have to do instead?"
You eat some more of your pizza, thinking of something not too difficult that's still a little daring, at least given her current state of dress.
"How about... you work off some of this pizza? For your new dare you have to do 20 jumping jacks..."
"Easy!"
"And 20 cart wheels..."
"Okay."
"And a 20 second handstand."
"Oh! Um... kay. Imma just change first."
"Nope. Can't."
Bree freezes, a second away from standing. "Why not?"
"Cause it's not part of the dare. I never said "change into gym shorts", I said jump. What, are you scared to do it?" you quickly challenge, trying to goad her into it.
"I'm not scared, I'm just..." Bree doesn't want to point out what you both already know. As she looks at you she gets a funny grin on her face. "Remember? I'm not wearing panties." It comes out as almost a whisper, as if someone could be listening.
"Yeah? Good! That'll just make it harder." Your sis puts on a playful grumbly look. She's plenty interested. You push her further. "Hey, you're the one who wants to sit around commando all day."
"No I don't!" she insists, pulling at her skirt with a smile. "You know this was just for a dare!"
"Well my dare has to be easier than spending all day at school like that."
Bree pauses in thought as she considers what you just said. Then in a flash she hops straight up into a jumping jack. She's a bit exuberant and sends her skirt fluttering upward. She instantly checks herself, her following jumps being much more controlled. Still, her bob of hair and light clothing manage to bounce energetically with each hop making the whole display plenty engaging to watch. She's burning through these though. Bree quickly counts up from a hush to a shout.
"...17-18-19-20!"
"See? You're like halfway done already."
Bree only purses her lips at you before stepping back a few paces. She runs forward two steps and launches into a near handspring. Her skirt flips upward with the rush of air, exposing her bum briefly. Upon landing your sis just turns and cartwheels back in the direction she came, but the next attempt is less jumpy with a much smoother motion. Still, her skirt waves about, this time flashing her crotch ever so briefly. It seems she favors her right side to push into the cartwheel, which means in one direction she's flashing her ass at you, and the opposite direction her pussy. After a few rounds back and forth your sis clues into this as well and is soon walking back to the same side so that she's only flashing her butt. Thankfully with her legs split and soaring through the air she can't help but expose fleeting glimpses of her lips against the soft glow of the TV, whether from the front or back.
After a dozen cartwheels your sis slows down, giving you that much more time to enjoy the view as well as scarf down some more pizza.
"...and 20!" huffs your sis. Definitely looks tiring to muscle through that many cartwheels. Her face is certainly showing it with how red it has gotten. But her embarrassment is likely playing as big a part in that redness as anything.
"Just one more. But it has to be for a full 20 seconds."
"I know!" your sister huffs again. Bree takes a bit of time, tucking her short hair behind her ears and looking around the room. Eventually she hunches down, placing her hands onto the floor in front of her, before straightening her legs and lifting her backside. She tries to push off gently from the floor but she struggles to get any momentum.
You've seen your sis do plenty of handstands so it's weird that she's trying to start while balled up like this. She might be trying to control her skirt somehow, but that sure isn't working. The front of her skirt is hanging away from her, straight down to the ground, while each kick is lifting the back of the skirt higher. All of her hip is exposed and more of the curve of her ass keeps creeping into view. From the side she looks like she's in a downward dog pose, except she keeps hopping and sticking one leg in the air behind her. Maybe she's seen other people do this, but she clearly doesn't know what she's doing. If she would just lift the leg closest to you she would gift you with a wide open view of her crotch. Of course that's exactly what she's trying to not do with this dare, but it's sort of (intentionally) unavoidable.
"Are your legs broken? You look stuck."
Bree looks over at you and sticks out her tongue. After another moment kicking uselessly, she pushes herself back onto her feet. Wasting no time, she springs all the way forward onto her hands. Her skirt finally flips all the way up, making her officially bottomless while her toes point skyward. Her shirt also slides its way up her body, her displaced skirt covering most of the skin her shirt is trying to reveal. She holds this for a few seconds, but she's drifting forward the entire time, and shortly flips ass over teakettle landing on her back with a thump.
It doesn't look like she's knocked the wind out of her, but there's no doubt she's knocked her pride. She takes a couple of big breaths motionless on the floor without paying any attention to her flipped up skirt. Her hairless little mound is now fully revealed and even accentuated by her splayed legs and stretched out body, her arms resting well above her head. Her eyes closed, she looks so much like Larissa right now, pussy and all, a fact that works to lengthen your cock a bit further. You remind yourself this is all just harmless fun, even as you stare perversely at your kid sister's most intimate features.
"Ah!" Bree yelps, planting a protective hand against her tight little mound. She shifts her hands in and out from covering her crotch, clumsily working to restore her modesty. "Um, so... that's good enough, right?" she asks while lifting her butt to help push her skirt all the way down.