Hot Summer Job/Take a seat on the couch to listen to your sister
"Today was sooo crazy weird!" proclaims Bree, rocking against you.
With one of your hands already having moved under her skirt to help 'support' her you decide you're better off avoiding a repeat of yesterday so quickly. You make your way to the couch and sit down with her legs still wrapped around your midsection. She seems disappointed but maintains her firm lock on you and continues her story with enthusiasm.
"Wearing this all day was exhausting!! I was always thinking about it, wondering if someone could tell I wasn't wearing panties or shorts. And whenever I leaned forward in my desk my... privates touched the seat! But my teacher didn't say anything so I don't think she saw.
"Oh, and gym! I was so worried about gym! I had to change into my shorts. I could've pulled them on underneath my skirt but I didn't want anyone to think I wasn't wearing my skort, so instead... I took off my skirt in front of everyone!"
"Wow, that is pretty daring!" you offer.
Bree relaxes her legs, sitting back onto your lap and looking down at the skirt in question. She plays dangerously with the bottom edge of the short pink bottoms. "Well, not really. I changed into them in the corner and did it really fast. But my friend Mikalya saw. She was at Nikki's sleepover. She asked me about it during gym and I told her I was doing the dare. So then she double dared me to get all the way naked in the change room after! And I did it!" your sis exclaims, shaking your shoulders again. "I almost didn't, but I did! I faced everyone and took off my shoes and socks and shorts and shirt and everything! I didn't cover at all! And it was extra embarrassing because I only actually had to change from my shorts to my skirt!"
"What about Nikki?" you inquire. "What did sh-"
"Riley? Are you home?"
"Daddy!!!"
Bree leans away from you and tries to step back off of the couch before catching herself. She's forced to swing one of her legs up in front of your face to get off of you. Her short skirt is lifted all the way up by her leg, briefly flashing her widely spread and surprisingly flush crotch not two feet from your face. Her vulva are parted wide with her legs showing off the pink folds between them. And if you didn't know better you would think them to be... moist.
Before yesterday you would've never looked at Bree the way you're starting to. She only flashed you for a second just now but that was all it took for you to burn the image of your sister's tight young snatch into your memory. Not to mention awaken your dick.
"I love you too cupcake, but can you get down please?"
Your inflating cock leads on as you move out to greet your parents. Bree has already leapt onto your dad but he's all but shaking her off of him. She slides down his front a little then gives up, releasing her leg lock and dropping to the floor, being quick to straighten her skirt.
Mom throws out a sigh of relief as you stroll up behind your sis. "Good, Riley, you're home. We were just about to call you since we're heading out now."
"Out?"
"We have a conference this weekend. We booked this months ago Riley. I even reminded you last week!"
You tune out your mom when you notice a thin little strip of wetness on the front of dad's work shirt. But that's where Bree was just... is she actually wet right now? Did your sis just deposit her spunk on dad's shirt? You brush your hand across your crotch and thighs feeling for signs of anything she might have left on you as well. Seems she only managed to get dad. Was it that little sliding motion that did it? Or did she only start to get wet after talking about her day at school?
"Don't worry, Riley takes good care of me!" announces your little sister as she hugs your waist.
You've missed most of the conversation. Something about you being in charge and responsible, etc, etc. You've heard it all before. It occurs to you that you should probably mention this whole sleepover thing. Then again, why would they even need to know? Especially since you're in charge now.
Mom kisses you both as dad takes out their bags.
"Love you! See you in a few days!"
The door closes and Bree cheerfully skips back into the living room. Landing onto the couch on her knees she gestures for you to join her.
"Come on! I want to tell you the rest of my story!"
You grin slightly and sit back down on the couch in the same spot as before.
"Umm... where was I?" asks Bree.
"You were 'all the way' naked in the girls locker room."
Bree giggles to herself beside you. "I was! I totally was!"
"Did you get Mikayla back?" you wonder aloud. "Or do you let your friends dare you for free?"
"She said she would do it too after I did it, but all she did was start to take off her underwear 'by accident' when she was taking off her shorts. I think someone saw her because she screamed a little when she did it, but she pulled them back up really fast. But LOTS of girls saw me. There were stares and whispers and giggles 'cause I got TOTALLY naked!"
As Bree says this she pulls herself into your lap again. She splays her legs out wide and leans her body into yours, nestling herself into your chest and atop your crotch. She wiggles with a soft moan before continuing.
"But I think recess was the hardest. There were so many things I was afraid to do because other kids might've found out I was half naked."
"You were fully naked when you changed after gym," you point out. "Why was recess different?"
"Because!" she states bruskly. "Gym is at the end of the day. And it's not that weird to be naked in the change room... but it is kinda weird. But it's a lot more fun when people don't know what you're doing."
Bree shifts in your lap and lifts her legs, planting her feet firmly on the couch on either side of you. Her knees point straight up as more of her body weight moves to your crotch. She wiggles some more and sighs.
"But at recess there's monkey bars and slides and swings and ladders and all sorts of stuff where someone might see me!"
You raise an eyebrow at that. "But you wear a lot of dresses to school. And not with tights or leggings as far as I've seen."
"Yeeeah," Bree confirms, gently rocking herself against your lap.
"So no one has ever seen up your dress before?"
"Maaaybe," she coos again. "But this time was that times a thousand. I was tingly all over all the time. It's never felt like that before."
Having your sister more or less openly admit to exploring her naughty side at school definitely turns you on. Although her light grinding against your crotch doesn't hurt either. You chuckle to yourself at the thought of Kylie teaching her a thing or two about exhibitionism.
"At least I made Nikki happy. I thought she would be bugging me all day again."
"Y-yeah?" you reply, carefully repositioning yourself beneath Bree's repetitive movements. You're just trying to make yourself more comfortable with all her squirming. "What happened there?"
"Not much. First recess we went under the slide. She told me to lift my skirt, close my eyes, and count to ten. That was it. She was cool again after."
"Uh-huh..."
"OH! Did you know Nikki's brother lets her borrow his phone? She was showing it off to people all day! I bet it costs a hundred dollars!"
Oh boy.
"Um, Bree? I thi-"
"Gawd, don't you knock?"
That voice is familiar.
"Susan said we don't have to knock when we come over 'cause she knows we're coming."
That one too.
Bree suddenly pushes herself off of you, spinning to one side to sit on the couch. She half whispers to you, "Who's that?"
"Kylie and Larissa. They're here for a sleepover."
Your sister's mouth and eyes open equally wide.
"REALLY?!!"
As the sisters stroll in Bree shoots forward and throws her arms around your neck hugging you tightly, then suddenly pulls away looking a bit worried.
"Does mom know?"
"Not exactly," you admit. "But she doesn't need to."
"Who doesn't know what?" asks Larissa, rounding the corner with her sibling. The pigtails holding back her short hair are very appropriate, since she is the youngest in the room, and exceptionally cute. You remember that Larissa is in the grade below Bree's, but despite that they're very close to the same age.
"Their mom doesn't know about the sleepover," explains Kylie, having already caught on. This girl has seemingly been inspired by Carrie's wardrobe since she's now sporting a blue halter crop top and black shorts, both skin tight. Her developing tits are well defined by the stretchy top, each mound distinct and shapely. The outfit seems to fall somewhere between dance wear and swim wear, though you'd hesitate to call it summer wear. She sheds a black bag behind her and keeps moving. "But I don't know how we're supposed to hide that from her if we're staying over."
Bree steps up gingerly from the couch. "Our parents are gone for the weekend," she announces. "We have the whole house to ourselves! And now you do too!"
"Our mom agreed to that?" an incredulous Kylie replies. "She won't leave us unsupervised for a few hours, let alone a whole day."
"Hey, I'm right here. I looked after you this week, didn't I?" you pipe up.
"Yeah, like I said... unsupervised," she repeats sticking her tongue out at you. "Oh, wait... our mom thinks your mom is looking after us. Which means no one can boss us around. Which means we can do whatever we want!"
The thought has a particular appeal to be sure. As the truth of it sinks in all of the girls slowly start to giggle and squeal at the limitless possibilities.
"Let's all sleep in the living room!"
"I want ice cream for dinner!"
"Your parents drink, right?"