Offline/Bring the two pairs of panties
You'd rather not start a fight. An equal share of panties should be good enough. It will cover their most private bits, not that Emma seems worried about that. Your sister could use more of a tan anyway. Kinda weird if you get stopped carrying panties through camp, but you can just say that you found them next to a cabin.
With panties in one hand and body wash in the other, you stroll leisurely back to camp. The forest looks, sounds and smells amazing after a rainstorm. Colors are dark and saturated. Everything smells crisp and clean. Birds chirp cheerfully between the branches. You can already hear the hustle and bustle of a busy campground as you get close to the main clearing. You're not sure what the time is, but there's no doubt breakfast is in full swing.
You don't need to hide since you're wearing shorts, a luxury that the girls went without, but you still dart behind cabins to make your way closer to the beach; partly to trace the girl's path and partly to avoid getting stopped for anything. You do sneak down to the beach mostly unseen, and thankfully avoid your parents, but you do have to smile and nod to a couple people including Aunt Becky who is literally carrying a bucket of clothing. Hopefully the colorful panties balled up in your hand passes for a washcloth.
Once you get to the beach you have a hard time spotting the girls. In fact they're not at the beach at all, in or out of the water. You worry that maybe they did get caught. You start spinning in circles, both figuratively and literally, trying to think of where they might have either hidden or been dragged off to. Thankfully you take a second to look down river and scan along the water's edge. You notice two heads bobbing above the gentle current close to the riverbank. Waving your hands in the air, you grab the girls' attention and they swim cautiously upstream toward you and into the shallows along the beach.
"What're you doing? Hiding?"
"Yeah! From my mom!" nods Asha tensely. "She gone?" You gesture all around you, highlighting how you're standing here alone.
"It was so scary! Aunt Becky almost saw us! She was down here washing clothes!"
"We ran up right behind her then ran away!"
"So why'd you jump in the river?"
"Duh! That was the idea!" sasses your sister. She points wildly toward the edge of the river. "We walked to the trees over there so she wouldn't notice us then climbed down real quiet."
"It didn't matter. By the time we snuck down she'd left," Asha adds with a touch of annoyance.
"Did you have a plan?"
"Of course! You were coming to meet us! I mean... we also talked abo-"
"You talked." Asha quickly clarifies.
"...about running into camp if you didn't show. But now you're here!" smiles Emma.
"I mean yeah, but..." You shake away the annoyance you still tend to harbor toward your sister. She's real dumb sometimes, but you suppose she makes up for it in other ways. "Whatever. Come get some shampoo!"
Asha stands up before you can even finish the word. She excitedly bounds toward you through the water, but after making a rush of noise she slows down and cowers, trying to stay silent as well as hide her still very naked young body. It's truly fantastic watching this nude young girl emerge from the water, her tiny nipples stiffened, her slit dripping, with only her sense of modesty available to cover herself. Once she prances her way up onto the pebbly rocks you tilt your small bottle and force Asha to extend her hands into a bowl to accept your offering. She immediately shoves her soapy reward onto her head, stretching her torso and working the all purpose wash into a luscious lather in her hair in no time. She then gingerly steps back down into the water, wading out into the river. Emma does much the same, following her cousin's footsteps the whole way. Once the girls are both soaped you follow suit, shedding your shorts and stepping out to get washed up alongside them.
The water isn't exactly warm, but it's plenty tolerable once you're in it. And it feels downright godly to get cleaned up. You dunk your head, stroke your dick, rub your taint, thoroughly cleaning yourself all over and instantly notice the difference it makes to your mood. The only thing missing is a shave. You did manage to clean up your crotch yesterday with some careful razoring but you're nearly as self conscious about your sparse teenage facial hair as you are your pubes. You try to remind yourself to take care of your wispy lip hair later.
You all swim around for a bit enjoying the water. Emma has some fun teasing Asha, probably because she's so easy to rile up, so you try to start something in the water, grabbing at butts and crotches while accusing the girls of not knowing how to wash themselves. Emma plays off it a bit and Asha is a good sport, but it doesn't go anywhere. You're admittedly hungrier than you are horny anyway, but not by much.
Emma is the first to exit the water. She stands on the shore shaking out her skinny limbs to help dry off while clearly searching for a towel. You're so glad you don't have any towels.
"Sorry, no towels still," you admit. "But I did bring you both panties."
"Oh, okay. And what else?" She looks around at the surrounding rocks wringing out her hair before it dawns on her. "You only brought underwear?!" exclaims your sister, finally noticing the total lack of clothing you arrived with. You shrug and Asha gives you a quick shove as she passes you on her way to shore. You follow close behind.
"Hey! It's better than nothing! Which is what you ran down here in!" Emma tries to fire back then grins a knowing naughty smile, hugging her body while dancing away the water still falling from her body. "Besides, most of your clothes are dirty," you add flatly.
"It's okay," sighs Asha. "Boys don't know how to dress girls anyway."
"Yeah, we know how to undress you." These words almost escape your lips, but you manage to stop yourself. Uttering a chuckle and a "yeah," you plainly agree with your cousin.
You all shiver and shudder on the riverbank trying to dry off faster in the light breeze. Deciding to be helpful you wipe away droplets of water off of the girls' figures. It does help, even if you're focused on the perks; sliding your hands down their backs, cupping their asses, rubbing their thighs. Your sister quickly reciprocates, and your cousin joins in too. Emma and Asha both drag their hands up and down your back while only skimming their hands over your butt and thighs. Asha ends up spanking you when you bend over to wipe your shins, just like she did to Emma last night. Emma laughs but then scolds her cousin and spanks Asha back on your behalf. Of course you insist on delivering your own palming of Asha's backside in retaliation and Emma then spanks you in return, smacking the ass she had just tried to protect. It all gets a bit silly but it does help you dry off, if only by making the time pass faster.
Emma takes her used light pink Hello Kitty panties for herself and passes her purple multicolored heart pattern clean ones to Asha who swiftly steps into them. You take mental snapshots of how good Asha's ass looks in your sister's undersized bikini cut panties, the bottom corners of her well defined butt cheeks poking through the leg holes while the waistband just reaches over the top of her ass. After you hop into your shorts the three of you walk away from the beach refreshed and ready for the day. Y'know, save for their questionable attire. Asha at least tries to bring up the topic of clothing when your mom seems to appear from out of nowhere, stopping you all in your tracks.
"There you are! Breakfast is getting cold! We were just about to clean up. Aren't you hungry? Why aren't you dressed?"
Awww crap.
Explain how you were all just swimming and got your clothes wet