Previous parts:
One | Two | Three
===
The two keys to controlling Luna were shame, and normalisation.
And that presented a careful balance for Jayna to manage in training her pretty little slave-sister. Luna was willing to do all the humiliating things that Jayna told her to do – masturbating for Jayna, licking Jayna’s cunt, going without panties, and claiming to want to fuck her father and brother – because she was intensely ashamed of herself, and terrified of people’s reaction if Jayna revealed the slutty things she had done.
But the more that Jayna made her behave like a good little sister-slut, the more normalised that behaviour became – and the more likely it might become that she would accept the idea of people knowing about it. It was good for Luna to feel like acting like an obedient, humiliated slut was normal – but not if it removed Janya’s leverage over her.
So Jayna needed to work constantly to deepen Luna’s sense of shame and guilt over the whorish things that Jayna was forcing her to do.
She set Luna a nightly essay, that she would write nude at her study desk in her bedroom before going to sleep. The topic of the essay was always the same – “Why I Am A Disgusting Slut” – and Luna was required to fill an entire page with new thoughts on this theme each and every night. She was incentivised to write quickly, without overthinking, out of fear her father or mother would come in to ask why she was still awake.
These essays would be full of bitter self-recrimination, over allowing strangers to see that she was wearing no panties, or over masturbating to orgasm while repeating that she wanted to fuck her brother. Each essay deepened her belief that she was dirty and slutty, even though she was being forced to do these things. Some of the essays contained “confessions” that she had raped Jayna on their first night in the house, because Jayna had told her so often that it was Luna who had initiated the abuse that Luna could now no longer tell the truth of the matter.
Of the finished essays, half went into a neat stack on Luna’s study desk, held down and concealed by a large history textbook. They were invisible to a casual eye, but would soon be discovered if (for example) Luna’s mother came in to tidy the room. Luna hated that they were there, and begged Jayna to hide or destroy them, but Jayna showed her no mercy, and as a result Luna became obsessive about cleaning her room – to give her parents no reason to do it for her – and became increasingly reluctant to leave the room, which gave her even more time alone with Jayna.
The other half of the essays were neatly folded and placed in Jayna’s purse, so that Luna would stay close to her and attentive when they went out together.
Jayna also took her foster sister for walks down to the public park by the church. Here she would lead Luna to the park bench near the back of the park – secluded, but still visible from the street if one knew where to look – and then remove Luna’s skirt and give her a copy of one of her essays.
“Read this out loud and masturbate,” she told Luna. “You can have your skirt back when you cum.”
Luna hated it, and didn’t want to, but after Jayna started to walk away, leaving Luna alone and naked from the waist down, Luna submitted. She sat on the bench, spread her legs, and began to read aloud about how she was a dirty whore who licked her sister’s pussy and orgasmed from talking about fucking her father.
Jayna let Luna wear sunglasses during these sessions, to somewhat hide her identity, but no one saw Luna on the first day, or the second, and she was able to reach a humiliated, shuddering orgasm and retrieve her skirt from Jayna without incident. Jayna loved how dirty and ashamed this behaviour made Luna feel, and she loved it when Luna would start to cry with shame but continue to masturbate through her tears. She thought it was important for a girl to learn she could cry and orgasm at the same time.
The third time they did this, it was a Sunday, and the street was busy with church-goers. Luna *really* didn’t want to do her routine with so many people about, and Jayna had to start to loudly announce that Luna hadn’t been so reluctant to bare her pussy and masturbate *yesterday* in order to get Luna to desperately shush her and agree to do as she was told.
Luna had only been playing with her pussy a few minutes – just enough time to get really wet, and start to moan – when she was seen.
“What are you doing, you DISGUSTING TRAMP?” shouted the voice of a woman from the street.
Luna jumped, and squeaked. She extended her hands desperately towards Jayna, hoping to get her skirt, but Jayna danced backwards.
“Not until you cum,” she said, smiling.
“Get dressed this minute, you LITTLE WHORE!” shouted the woman. She was advancing towards Luna now.
Luna’s face was pale with shock and humiliation. Seeing that she wasn’t getting her skirt back, she ran. Jayna watched her vanish into the bushes. She didn’t know where Luna was running and didn’t care. She would be back.
“I’m sorry, ma’am,” said Jayna to the advancing woman. “I don’t know who that girl was, but I was trying to get her to stop being so disgusting. Thank you for helping to scare her off.”
The woman seemed satisfied by this, and, with some muttering, retreated to the street, and left.
Jayna waited.
In time, Luna’s voice came from the nearby bushes. “Jayna? Please can I have my skirt back?”
“Not until you come back to the bench and make yourself cum,” said Jayna.
“But there are people!” objected Luna.
“Luna, I can’t believe how ungrateful you are, you little slut,” said Jayna in a cold voice. “After I cover up how you raped me, and help you look pretty in photos, and you won’t do this for me? Would anyone else even *speak* to you, if they knew how you wanted to fuck your father and brother? No, they wouldn’t – they’d think you were a disgusting little fuckpuppet. Which, honestly, you are, but *I* love you anyway. Now come back to the bench like a good girl and make yourself cum. Unless you want to explain to people why you’re running around the park with your pussy exposed.”
This was all too much for Luna – too confusing, and shameful, and frightening. Nervously, hesitantly, she crept back to the bench, looking for people – there were none, just now – and then sat, spread her legs, and began to play with her cunt.
“And read the essay,” Jayna reminded her.
This time Luna got almost all the way to her orgasm before she was seen. This time the interlopers were two young men – maybe 20 years old – who had crossed the park while walking to the nearby shops.
“Holy shit,” exclaimed one. “Look at that CUNT. She’s jilling off right here in the park. What a SLUT.”
“You’re right,” laughed the other. Both men had stopped to watch Luna. “You can see her FUCKHOLE. Oh, GROSS. What a NASTY BITCH.”
Jayna had thought that Luna might jump up again – and she almost did – but she was also *so* close to cumming. Luna *wanted* to cum – and she knew that if she stopped she would have to do it all again. So instead, she tried to tune out the boys – even though her cheeks were blushing bright red – and intensified her masturbation, muttering the words of the essay to herself.
“Louder, Luna,” urged Jayna. “So they can hear you. Or I’ll make you do it again when you’re done.”
Luna moaned – but did as she was told. “I’m so dirty because I keep saying I want my brother to cum inside me,” she said, loud enough to be heard by the boys. “I lick my sister’s pussy like a disgusting lesbian slut. I masturbate in public.”
The boy started to laugh – a loud, cruel, mocking sound – even as they openly watched Luna masturbate.
And to the sounds of that laughter, Luna finally found her orgasm.
As she shuddered and moaned, Jayna gave her her skirt back.
“That’s all for today, boys,” she told the audience. “Strictly a look-but-don’t-touch arrangement. But if you let the little slut leave in peace, she’ll be back at the same time next Sunday for another show.”
The boys laughed again. “Don’t worry, we’re no rapists,” said one – which Jayna thought was a shame, really, even if she wasn’t quite ready to have Luna raped by strangers yet – and both boys turned and departed the park (although not without a couple of backward glances at the two girls).
When Luna was dressed, she placed a hand on Jayna’s shoulder urgently. “What you said about… about next Sunday,” she said. “Jayna, I can’t – I can’t do this again. I can’t do it when I know they’re watching.”
“Yes, you can,” said Jayna sweetly. “I’m your sister and your girlfriend, and you’d do anything for me, wouldn’t you?” She leaned forward and kissed Luna on the lips, and then added, “and you’d certainly never want to make me angry, right?”
She placed a hand idly at the neckline of Luna’s blouse. It was a cute gesture, but the significance of it wasn’t lost on Luna. Jayna’s fingers were curled as if to grip the fabric of the blouse, and they were both suddenly aware that Jayna could leave Luna topless by simply ripping the blouse away.
“Tell me you love me, and you’ll obey me, always,” whispered Jayna.
Luna knew she had no options. “I love you, Jayna,” she whispered back. “And I’ll obey you, always.”
===
That night Jayna changed the sound coming out of Luna’s sleep headphones. Now not only did they contain a loop of her chanting that she wanted to fuck her father and brother, and audio from her reading from her humiliating essays – but they also contained the comments of the people who had seen Luna in the park, which Jayna had recorded on her phone.
“You DISGUSTING TRAMP!” the audio would shriek suddenly in Luna’s ears as she slept. Or “Look at that CUNT. What a SLUT.”
And when those words were spoken, the vibrators resting against her pussy and ass would speed up. And Jayna, who had been sleeping peacefully with her head on the pillows and her sister in her customary upside-down position beside her, would wake to the pleasant feeling of her sister-girlfriend simultaneously crying, cumming, and licking Jayna’s pussy.
===
===
Edit note: In the second paragraph, the names “Jayna” and “Luna” are the wrong way around at the start of the second sentence.
Thank you, I’ll fix it now, and in the master file. I really appreciate the catch.
I suspect there’s going to be more of this particular transposition before the story is done.
I should never have picked two girl’s names ending in “A” for the same story, but I’m committed to it now…