Make a scene

"Oh my god! Sarah. Don't move. Your top's come off. Just stay still."

"Huh? Aaah! Get it back on. Did anyone see?"

"Don't worry, I don't think so. I was only gone for a few minutes at most and I didn't see anything wrong with your top earlier."

"Wait what? You just left me here by myself?"

"Of course not. The kind boys over there watched over you and our stuff while I was gone."

"Boys?" she turned to see the three boys who were still very pleased to see her. Her eyes were like saucers and if it wasn't for her face being flushed already from the heat of the sun, her face would be bright red. "OH MY GOD. Just get this top back on me. Hurry." she demanded.

"Alright alright. You'll have to sit up first. Quickly." Jess pulled her sister up, Sarah was very glad that her back was the only things the boys could see. She pulled the strings around and had the top back on in a few seconds. "There you go. Anyway, I guess I should apologize for just leaving you. You were sleeping and you can't go swimming anyway, so I thought I'd just take a quick dip while you were taking a nap."

"It's fine, Jess. Don't worry about it. I just hope those boys didn't see anything." She glared at them.

"I don't think they did." Jess grinned.

"Hey, Jess. I'm getting tired and the sun's getting low. I think we should head home."

"Alright, let's go." Jess helped her sister up. She had pulled down her bottoms earlier so it was no surprise to see that her butt crack was hanging out. "Hang on a sec." Jess said as she picked up the mat and put it in the bag. Meanwhile Sarah made sure to keep her back to the boys, she didn't want to even look at them. They were very grateful since they hadn't much opportunity to see her butt since she was laying on her back the whole time. Now she was deliberately making sure they got a good view of her barely covered ass.

"Wait, I need to pee first." Sarah said.

"Alright. I'll have to help you, remember."

"Ugh. I know."

"Let's go then. I think there's a toilet over there."

They made their way to an outhouse.

"Um, looks like this isn't big enough for both of us." Jessica said.

"So how am I supposed to pee, then? I can't pull these down by myself."

"We'll just have to take them off out here, there's nobody around. It's late and everyone's at home now anyway."

"Are you crazy? I don't want anyone to see me. I don't care how late it is." She exclaimed.

"Well, it's that or you can hold it until we get home."

"Hmmph, I don't think I can hold it that long. Fine, be quick."

Jessica grinned and pantsed her sister, this time consensually, which was weird for her.

"Hey! Why didn't you just untie them." She said.

"That's no fun." Jessica grinned.

Sarah's eyes darted around the beach as she stepped out of her bottoms, she couldn't see anyone but someone could be blending in. "Open the door." She ordered.

"Yes, ma'am." Jessica said sarcastically as she reached for the handle and opened the door. Sarah wasted no time in sitting her bare booty on the toilet seat.

Having nothing else to do as she listened to her sister pissing, she scanned the beach. There was a few people still there but nobody nearby, and nobody that was sitting up. Maybe nobody saw her after all. She thought so, until she saw movement in the bushes a few dozen metres away from the toilet. The boys from earlier? A dog? The wind? She wondered.

"I'm done. You'll have to flush it."

"Then come out."

"Clothes first."

"Nope." Jessica grinned and stuck her tongue out.

"Hurry up or someone will see. Put my bottoms on."

"There's no room to move in there. You'll have to come out."

Sarah was surprised by how much sense Jess was making. She gave in and stepped out from the cover of the toilet and stood in front of her sister, with her back to the bush which seemed to be coming to life from how much it was moving around as she did so.

"There, not so hard was it? There's nobody even here to see you anyway, Sarah. Chill out."

Sarah worriedly turned around, only seeing what her sister saw moments earlier, there were people in sight but they were all laying down and didn't seem to take any interest in their surroundings. Jessica reached inside and flushed the toilet, closing the door after she did so.

"Okay, now can you put my bottoms back on. Please."

"Hold on, are you a toddler? You need to wipe first."

Sarah looked around outside the toilet. "Yeah, but there's no toilet paper out here and I didn't see any inside either."