Olivia knelt on the ground, wretching and shivering, her face pale and covered in sweat.
I smirked. "The smell, the humiliation...you can't escape it, can you?"
"P...please, no..." She whimpered. "I can't stand this..."
"What is wrong? Don't you like it when men take you in the public place, or when they take advantage of you?" I hissed.
"No...I don't...please...no more..." She begged, and then wretched again.
"Do you want to please me, Olivia?" I asked her.
She looked at me, her eyes filled with tears, her face flushed.
"Of course, Master..." she whimpered.
"Well then, why are you fighting it? You are a slut, and you know it."
Olivia looked down, her face burning with shame. "Yes, Master..."
"Then accept it. What you did just now was disgusting and degrading, wasn't it?"
"Yes, Master..." Olivia's voice was trembling as she spoke.
"So, what's the point in trying to deny it? You like to be a slut. You like the men to have their way with you, and you love the humiliation."
Olivia looked at me, her face red with shame, tears running down her face.
"Answer me. Say it. You want to be a slut, don't you?"
"I...I do." Olivia admitted. "I want to be a slut..."
I smiled and gave her breasts a slap.
"Now, go get cleaned up."
Olivia nodded and got up, leaving me alone. I turned to Alicia. "How is Lise? Is she still resisting?"
She nodded.
I licked my lips and went into Lise's room. "Alicia, tie a spreader bar to her knees and make her kneel. Bind her wrists and raise them into the air. Give her nipple clamps as well."
Lise cried out as she was forced to kneel, her legs spread apart, her pussy and ass exposed, her nipples clamped, and her hands tied.
I sighed. "Very unlike your sister, aren't you?"
"You turned my sister into a slut." Lise spat.
"She is who she already is. I am merely bringing out her character."
"No. She isn't. She is a kind, caring, sweet person. She's not a slut."
"Oh, so you don't like my little show?"
"Your little show?" Lise shook her head. "You call that a show? You call forcing my sister to walk naked in the park a show? You call making her give a blowjob to a complete stranger a show? You are a monster!"
I raised my eyebrows at the sudden outburst. "You have a lot of energy, don't you? We'll have to work on that. Alicia, is Olivia clean and ready?"
"I'll...I'll go check on her, Master. I'll bring her here."
I nodded.
A few minutes later, Alicia entered with a freshly-showered Olivia, her face pale, her eyes wide, and her body trembling, kneeling before me.
"I'm back, Master."
"Good job. Olivia, your sister said you're not a slut. What do you think?" I smirk, looking at her.
"I am, Master. I'm your slut." She whispered, bowing her head.
"Mmmm. Would you like to convince your sister about that?"
"I...I...what should I do?"
"Well, if you're a real slut, you should do the thinking yourself, shouldn't you?"
Olivia whimpered, her face bright red. "I...I will do anything to please you, Master."
I laughed and turned to Alicia. "Bring me a small cup of diuretics. I know just what to do with the two girls."
Alicia nodded and left to fetch me the diuretics, and I smiled at Olivia, who was kneeling in front of me, trembling.
"Look at your sister, Olivia. Bound and kneeling. You're a good girl, aren't you? You don't need spreader bars to spread your legs, nor do you need to be forced to kneel. You want to please me, don't you?" I cooed as I stroked her naked back.
"Yes, Master." Olivia blushed. "I'll do anything you want. Anything at all."
I turned to Lise. "Are you jealous of your sister, Lise? She's a much better girl than you are."
"N...no, I don't..." She whispered. "I won't let you control me."
"Alicia, give me the diuretics. Olivia, pinch your sister's nose for me, will you?"
"Yes, Master." Olivia whispered.
I smiled as Lise was forced to open her mouth to breathe, her body squirming in her bonds. I slowly poured the diuretics into her mouth, forcing her to swallow them.
She cried as she was forced to swallow, her mouth burning with the sour taste.
I stroked her head and poured another cup of diuretics into her mouth.
She choked as she drank the second cup, and her body started to tremble.
I smiled. "Now, that wasn't so bad, was it? Now, Olivia, I want you to make your sister pee on your face. Could you do that to please me? Could you get her to squirt?"
Olivia's eyes widened at the request, and she looked at me. "I...I...I don't know, Master..."
"What, don't think you're a good enough slut? Come on, I've seen you." I smiled as I stroked her head. "Make your sister pee on you. Be a good girl for me."
Lise's eyes widened, and she shook her head in fear. "No, Olivia...please no...don't..."
Olivia blushed. "I...I'll try..."
Olivia crawled towards her sister, who was trembling in her bonds, her legs spread as she knelt.
I frowned. "Alicia, make Lise stand."
Alicia pulled Lise up, forcing her to stand while Olivia took her position between her sister's legs.
Lise's eyes opened wide as her sister moved and knelt between her legs, opening her mouth. "No...no...Olivia..." She whispered in terror. "No!"
Olivia looked at me and I nodded at her. She put her hands on her sister's waist, and buried her mouth in Lise's groin.
Lise gasped as her sister's soft lips touched her labia. "No!" She cried, trying to close her thighs, but the spreader bar preventing her from doing so. "No!"
"You can do it, Olivia. You're my good little slut."
Olivia nodded and pushed her tongue into Lise's pussy, making her sister tremble as she moaned.
Olivia kept working her tongue and pushing it deep inside her sister's pussy.
Olivia nodded and sucked harder, making Lise gasp.
Lise was shaking as she stood, and I saw tears streaming down her face. "No...please...no..." She whimpered, but she could not fight back.
"Make her pee."
Olivia kept sucking and licking her sister, her hands holding onto her thighs, forcing them apart.
Lise's eyes opened wide as she felt the pressure building up inside her, her muscles tensing up, and her body shaking.
She looked at me, and I saw her begging me to stop this.
"Olivia. Make her squirt. Force it out of her."
"Yes, Master."
Olivia worked hard, her mouth buried deep inside Lise's pussy, and I saw her sister trembling.
Her eyes were filled with tears as she cried and tried to fight it.
"Master, she...she's fighting it...she doesn't want to..." Olivia cried, her mouth full of Lise's pussy.
"Olivia, I know you're not a weakling. You can make her squirt." I said, stroking her head.
Olivia nodded, working hard on Lise's sensitive areas as Lise shuddered and cried out. Alicia held Lise's wrists high, not allowing her too move too much.
I smirked, watching Lise's face turn red and her body start to shake, her eyes filled with terror. "No, Olivia, no, no!" She screamed.
I grinned and watched as Olivia continued to stimulate her, pushing her tongue inside and working them back and forth, making Lise shudder and cry.
"You can do it, Olivia. Make your sister pee for me."
Lise was shaking, and her body started to jerk violently, her eyes rolling back into her head, her mouth opening wide as she screamed.
Olivia closed her eyes, expecting a fountain of urine to hit her, but Lise didn't release, her body climaxing, but not squirting.
I watched in amusement, knowing that Lise's resistance would soon fade, and her need to pee would take over as the effects of the diuretics settled in.
"Come on, Lise. Just let it out. You're going to pee anyways." I said.
Lise shuddered, her eyes shut tight as she clenched her muscles.
I sighed and gave Olivia a pat on the head. "It's alright, Olivia. She just needs a little push."
Lise whimpered, her body shaking, and Olivia could see the desperation in her sister's eyes as she started to beg.