All characters engaged in sex are over 18.
*****
In the morning, Kelly sat up and stretched. Sarah lay on her back, daydreaming. It was Monday -- their day off because the markets were closed. Her brother Rob snored slightly. Kelly said to her sister: "I had a dream last night. The bed was, not shaking, but sort of rocking. Then you said 'he just fucked my bum' or something like that. She looked at her sister, who smiled back.
"It wasn't a dream, was it?"
"No."
Awake now, Kelly wanted to know. Rob would wake soon anyway. "What was it like? Did it hurt?"
"Yes, it hurt at first but once we started, it was very nice."
"
Very nice?
Still I bet you've done that before, though."
"Nope. First time ever in my bum."
"Really? Oh hey! That means your brother just sorta took your virginity."
"I guess so!"
Rob stirred, stretched, yawned. "What you two talking about?"
Kelly lay on her side, reached for his cock and squeezed it: "Did you really put this in her bum last night?"
"Oh. That. Well, yes I did little missy. Reckon if you behave like a good girl oughta, mebbes I might put it in your'n too one day."
His attempt at a klondike accent was pathetic and they told him so. It erupted into a tickling match, until Kelly said "Wait! I gotta go pee. And don't you
dare
stop me. I'm not changing the sheets!"
Rob and Sarah looked at each other and shrugged. Kelly edged out of bed, saying: "What?
What?"
Her siblings grabbed her, pulled her back onto the bed. Rob held her while Sarah tickled her. She protested, fervently at first: "No! No! The sheets."
It was Sarah who argued with her: "It's Monday. Need changing anyway."
"But the mattress!"
"Has a sweat-sheet on it. Won't matter."
Momentarily Kelly stopped wriggling, Rob eased off his tickling: "Any chance of appealing to your better sides to maintain my dignity?"
At the same time, Sarah said "Nope" while Rob resumed tickling, saying "Fat chance."
"Oh no! Fuck! All right, all right. What you want?"
Rob gestured with an open palm towards Sarah, giving her the honour of choosing.
"Oh, um. Yeah I know. Lay back and piss in the air."
"That all?"
"Well, now you mention it, make sure you piss on your own tits."
"You guys are perverted..." But she lay back, wriggled off her pyjama shorts, and went to get her top off too.
"No, leave that."
"Jesus, who put you in charge?"
"You did. It's that or tickling."
Kelly would have been happy with either, but wanted to please her -- increasingly kinky, older sister. She made a show of arranging her cotton top flat against her chest, bent her knees to plant her feet on the bed, and spread her pussy apart with her fingers.
Her first couple of spurts went straight up, hitting her thigh and hand. She adjusted, pushed and grunted out a small stream that arced up but fell short, on her belly. The fabric stuck to her, turned transparent. "This is impossible."
"Try!"
"You're still perverts...Nnngh"
She pushed, and was rewarded with a hissing stream that went high in the air and landed on her left breast. Rob watched, fascinated, as the fabric became transparent. Sarah was idly stroking her tits as she watched. She'd been naked all night, taking what warmth she needed from her brother's body.
Kelly tried again. Her stream was strong, it kept going, but she couldn't aim to reach her tits. It faded out. Her belly was drenched, the fabric transparent, crinkled over her tummy and one breast that she'd managed to wet.
Sarah knelt forward on the bed, got beside her sister, saying; "I'll help."
She held her pussy apart, aimed, and pissed on her sister's tits. It splashed, hissed, sputtered. Kelly giggled like a maniac, Sarah merely said: "Got you back for pissing on me in the bath."
"That was ages ago -- you been looking for revenge all this time?" She was laughing though. Rob watched as Sarah's pee spurted, dripped, then stopped. While idly looking at his little sister's tits through the drenched cotton top, he realised the reason they were so comfortable, so free with each other's desires was because it was always
fun.
Sex between them was always just good fun. No hassles, no worries. It made him smile.
Kelly got up, dripping wet, pulling the sodden garment away from her body. "OK, you had your fun but I'm not cleaning that up." Rob knew when to retreat and they ran off leaving Sarah with the mess. She yelled after them: "At least make the bloody coffee, then!"
It rained. The industry had the day off, there would be no buyers or deliveries. Kelly got playful and went outside in the rain, stark naked, dancing like a harem queen. Sarah and Rob watched from the porch, sipping hot coffee.
"Rob. She's still young at heart. I'm almost 35, you're what, 24? We've both had, er, normal relationships. I'm scared for her though. She's never known anybody, like, that way, except us. Are we fucking up her head for the future?"
"Yeah, worried me too. But you know what she told me yesterday?"
"No, what."
"OK, when she tells you, act like you didn't know. She's keen on a bloke at Dixon's. He asked her out."
"That's great! Why did she tell you, though?"
"She asked if I'd mind -- she'll ask you as well."
"What did you say?"
"I told her I wanted her to be happy, and if he, or anybody else, made her happy that was enough for me."
"Good answer. She OK with that?"
They watched her gyrate and dip, then wash her hair in the torrent.