Previous chapters:
One | Two | Three | Four | Five | Six | Seven | Eight | Nine | Ten | Eleven | Twelve | Thirteen | Fourteen | Fifteen | Sixteen
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After dinner the girls went to their bedroom. Madelyn updated her Slut Diary, writing about how she had eaten and drunk Sean and Logan’s cum. After a brief pause, she also wrote about how she had kissed Avery and let Avery rub her cunt.
She didn’t want to write it. She was embarrassed enough about the fact that it had happened. It was incest. It was lesbianism. It was a slutty sexual interaction with her beautiful, innocent younger sister. She didn’t want Uncle Sean to know, and she didn’t want to find out what comment he might make about it.
But she knew that Avery – honest, trusting Avery – would write about it, and the cost of securing Avery’s silence about the pissing had already been high, and if her journal didn’t agree with Avery’s, she would get in trouble.
“I kissed my sister Avery on the mouth and put my tongue inside her mouth, and I spread my legs and let her rub my clit, and it made my cunt wet, and I enjoyed it.*
After that it was bedtime. They weren’t going to be chained up tonight – thankfully – but Uncle Sean still had instructions for them.
“No clothes in bed, girls,” he said. “No reason you can’t sleep naked, and I don’t need to be doing extra unnecessary laundry. And you’ll find the toilet on this floor is locked at night. The flush makes a racket in the pipes and wakes me up. But I’ve set up a litter tray in the back yard.”
Madelyn was horrified. “A… litter tray?”
“Like for pets,” said Uncle Sean. “Just go out and piss and shit and then cover it over with sand. It can be your job to empty it every few days. Don’t worry, it will be dark, the neighbours probably won’t see.”
Madelyn had no intention of pissing like an animal in an outdoor litter tray – especially seeing as she would apparently be nude. Urinating into her sister’s mouth was slutty and disgusting – but it suddenly seemed far more appealing than it had.
Then Uncle Sean took his erect cock out, and Madelyn had to apologise for being a disgusting slut, and then she had to tongue-kiss him goodnight with his erect cock poking against her belly, and she knew in the morning that there would be another condom of cum for her to drink.
When the lights were out, she stripped nude and got into bed with Avery. Avery immediately cuddled up to her, her sister’s small tits pressing against her own, her sister’s knee seeking to press between her thighs for warmth.
“Aren’t you excited, Madelyn?” Avery said. “We’re going to Stenway tomorrow.”
“I don’t want to go to Stenway Academy,” said Madelyn. “You saw what it did to Kaitlyn. She came back with big fake tits, and she was a bimbo, and she was drinking piss. I’m scared of it.”
“But Kaitlyn looked happy, though,” said Avery. “Don’t you want to be happy?”
“I want to be free,” said Madelyn. “I want to go home to mom, and make content for social media, and… and flirt with boys on my own terms, not because I have to tongue-kiss my gross uncle and cousin.”
“Ssh,” said Avery, and kissed her on the lips.
Madelyn knew she shouldn’t condone this. Normal girls didn’t tongue-kiss their sisters. Avery was being… corrupted by what was happening to her. It was making her slutty, and it was Madelyn’s responsibility to set an example.
But it felt so nice. Not just because Avery was a surprisingly good kisser – although she was – but also because it was affection. Avery was the only one who had given Madelyn honest affection since they had left home, and Madelyn really needed that affection right now.
So she kissed her sister back, and let her sister’s tongue explore her mouth, and when she felt Avery’s hand pushing against her groin, she parted her legs and let Avery find the wetness of her gash, and sighed as Avery began to run a finger back and forth over her juice-slick clitoris.
“I love you, Madelyn,” whispered Avery between kisses.
And Madelyn knew that Avery was getting confused – getting the love of a sister for another sister mixed up with the love of a lesbian for her girlfriend – but she didn’t correct her. She just moaned, and bucked her fingers against Avery’s delightfully pleasurable fingers, and said, “I love you too, Avery.”
After a while, she felt herself nearing an orgasm – but Avery suddenly pulled away.
“No… it’s okay… you can keep going,” moaned Madelyn.
“We need to do the other thing,” said Avery. “Trust me, it will feel good like this.”
She moved her body down Madelyn, until her face was near Madelyn’s groin. Then she leaned in and pressed her lips against Madelyn’s cunt. She lightly flicked Madelyn’s clit with her tongue.
“No…” protested Madelyn.
“Yes,” said Avery. “I know it’s hard when you’re wet, but it feels better. Just relax. Trust me.”
And Madelyn knew this wouldn’t end until she gave Avery what she wanted. So she did her best to try and relax her bladder.
It was hard to piss while aroused. And the erotic warmth of Avery’s mouth on her cunt didn’t help. Nor did Avery occasionally running her tongue across Madelyn’s clitoris, or probing briefly into her fuckhole.
But she succeeded. Her bladder slowly relaxed, and then she felt the blessed relief of hot piss squirting out of her urethra into her sister’s mouth.
Her sister reacted with delight, making little muffled noises of pleasure as she drank her sister’s piss. And her tongue went wild now, actively stimulating Madelyn’s clitoris even as Madelyn pissed.
Avery got what she was intending. About two-thirds of the way through pissing, Madelyn felt herself orgasming.
She hated it. She hated that she was cumming from pissing in her sister’s mouth.
But Avery was right. It felt so good. She felt delirious with pleasure.
“Thank you,” she moaned. “Thank you.”
“It’s my pleasure, sis,” said Avery, when it was done. “I love you. But now I need to piss!”
Madelyn panicked. Did Avery expect Madelyn to drink her own piss in turn now? She couldn’t! She couldn’t lick her sister’s cunt, or drink her urine! It was too slutty!
But Avery was getting out of bed.
“What are you doing?” asked Madelyn.
“I’m going to use the litter box,” said Avery. “It’s okay – it’s dark, and daddy and Logan are in bed. No one will see.”
“No!” said Madelyn. She wasn’t at all convinced that Sean and Logan would stay sleeping. She could see them emerging from their rooms – finding Avery naked – deciding they didn’t really need to honour their deal with Madelyn…
“Well, I don’t want to piss on the floor, silly,” said Avery. “And the toilet’s locked. It will be fine. Don’t worry.”
“No,” said Madelyn. “I’ll… I’ll come with you.”
“Well, okay,” said Avery. “It’s fun when girls go to the toilet in groups!”
Madelyn did not like wandering around naked at night, in this house that was so clearly predatory. But as they opened the door and stepped out into the corridor, she was reassured that the lights were off, and there were no sounds of movement.
They made their way through the house, and out the back door. Sure enough, there was a little sandpit by the back door.
Avery squatted over the sandpit with legs spread, and began to rub her pussy with one hand.
“What are you doing?” hissed Madelyn.
“This is how I always piss,” said Avery. “That’s how I knew it would feel good.”
Madelyn had her hands crossed over her tits, and was desperately looking around, watching for any sign of movement or light in the house, or movement in the neighbouring houses.
All was still.
“Just hurry up,” she said.
Avery rubbed her pussy for a bit, and then, finally, began to piss. She sighed happily, and then, a moment later, her body started to shake, as she orgasmed while pissing. When it was done, she looked at her hand, which was wet with piss and cunt juices, realised there was no toilet paper, and then shrugged and licked it clean.
“Okay!” she said. “That was fun! Let’s go!”
They ran back inside the house, all the way to their bedroom, and jumped into bed.
And Madelyn was left to fall asleep with three unwelcome thoughts circling in her head.
My sister is a good kisser.
It feels good to piss into my sister’s mouth.
My sister looks cute when she’s pissing.
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The next morning, Uncle Sean just walked in on them while they were still in bed. Luckily, both girls were hidden under the bedsheets.
“Rise and shine, girls,” he said. “Your first day of school is today! And from now on I’ll be expecting you to upgrade your personal hygiene.”
He threw some items onto the bed.
“Have you ever used these before?” he said.
There were two boxes that seemed to contain some kind of tube and pump. And there were two shiny metal objects that looked like small spinning tops.
Madelyn shook her head.
“This is a butt plug,” said Sean, picking up one of the metal tops. Madelyn could now see that the “top” of the top, if it were made to spin, was a flat disc with a cute pink love-heart on it. “It goes in your ass. It will hurt, but you will get used to it. Stenway requires its girls to be plugged during school hours.”
He picked up the other item – the box.
“And because you will be plugged, from now on you will give yourself a daily enema, to ensure you do not make a mess when the plug comes out. The tube goes in your ass. You pump soapy water in. Then you let the water out again. Do it in the shower to avoid making a mess. If you do not do it, or do not do it right, I will pump the water into you yourself, and then plug you, and you can go to school with your anus full of water. Do you understand me?”
They nodded. “Yes, daddy,” they chorused.
“Good girls,” he said. “Now, get to it.”
And he blessedly left the room, giving them the privacy to rise and run to the shower without anyone seeing their nudity.
They showered together, to help each other with the enemas. It felt weird pumping water into her ass, and she felt very full while it was in there, and she was humiliated by the gross nature of what came out when she released it, but she had to admit that she felt very clean and good when it was done.
She tried to work the plug into her ass.
“It won’t fit,” she complained.
“Yes, it will,” said Avery. “I’ve seen way bigger than this on the internet. Here, let me help.”
She wiped some soap around Madelyn’s anus for lubrication, and then pushed the plug against her sister’s butthole. Madelyn leaned forward and tried to relax her ass, and a minute later, there was a “pop”, and the plug went in, with the flat disc sticking out to avoid it getting lost forever up her ass.
Avery giggled. Then she turned around for Madelyn to help with hers, and Madelyn obliged.
“Honestly, it’s cute,” said Avery afterwards, looking at hers in the mirror. “I like the heart. And it feels good, doesn’t it?”
No, thought Madelyn. It feels intrusive and slutty. Like I’m having my ass raped while I’m walking around in public. Like I have Uncle Sean’s finger up my ass at all times, and he’s laughing at me.
But she didn’t like making Avery sad, so she said, “Yes, it’s cute. It’s not so bad.”
Avery spent a little longer admiring her butt, and then both girls returned to their bedroom, wrapped in towels.
And that was where they saw – for the first, but sadly not the last, time – the Stenway Academy uniform.
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