"Thank you, Master."

"Thank you, Master," Marlene panted, looking up at me as I stood over her bound form. "It's been a long time since your slut has done that."

"So you accept me as your master, Marlene?" I asked as I motioned for Paula to get up off her sister's lap. "You agree to become my slut for the next month, to do anything I want when I want it?"

"I do, Master. I'm your slut completely." Marlene agreed readily, "I'll do anything you ask of me, Master."

"Very good," I said the thought of having these two sisters at my disposal for the next four weeks being enough to revive my flagging cock to full hardness. "Paula, remove the handcuffs and let my new slut up." I commanded as I sat on the couch. Paula approached her bound sister warily afraid that there would be retribution for her earlier transgressions on Marlene's body. She quickly unlocked the handcuffs and untied her sister's ankles from the chair before shrinking away as Marlene tried to grab ahold of her younger sister, anger marking her attractive features.

"Little bitch," Marlene hissed at Paula as she tried once again to strike her sister.

"Stop that, Slut!" I shouted, my voice bringing Marlene to sudden stop. "Paula was acting upon my commands, like the good slut she is. If you're angry than I'm the one that it should be directed at." I said as I stood up and stood between the two sisters.

"I'm sorry, Master." Marlene said bowing her head to avoid my gaze. "It won't happen again."

"You're right slut, it won't happen again," I said as I moved back towards the couch. "Because I'm putting Paula in charge of you. You'll follow her directions as if they were commands from me, and if you don't act in a way to please her, she has the authority to punish you. Do you understand, Slut?" I said as I sat back down.

"Yes, Master." Marlene says softly glancing at her younger sister who stood against the wall watching the interaction between the two of us.

"Good," I said as I turned to Paula, "Do you accept this responsibility, Paula?"