"Do you have a sister?"

Of all the questions you could ask, it may have been least what Jennifer was expecting. And immediately her face drops. It's heartbreaking to see the gorgeous, nude, willing, and now totally mopey girl before you.

"I don't understand...." And she doesn't or else she wouldn't have reacted like this. "Are you hoping that I have a sister who is prettier or naughtier than me? Because I wasn't kidding, I'll do whatever you want." Her voice is filled with horny desperation.

"No honey," Erin tries to explain. "We were hoping you had a sister who was exactly as pretty and naughty as you."

And the words just hang there in the air. Jennifer doesn't understand for the longest time. But you can see her pretty face trying to process what you're getting to. And it takes a while. And the time seems to drag past. And she thinks. And she thinks.

And suddenly her eyes light up and her jaw drops. you're not sure if that's a good reaction or a bad reaction. "What... do you want?" But she certainly knows.

"This is what we want hon, and I'm going to be totally honest with you, because if you want to live with us, you have to know what you're in for." Erin says, and then glances at you as if to make sure you're paying attention to what she's about to say. And then she describes a situation more depraved and kinky than any you'd ever thought would enter your, admittedly naughty, girlfriend's mind. "We want you to call your sister and tell her to come over. Then we want you to strip her immediately, and shove your tongue as far into her pussy as you can, until she screams, until she can't stop screaming."

Jennifer just listens, intently, shocked, but clearly turned on.

Erin continues. "Then you're going to smack her face and tell her she's a filthy slut for letting her own sister do that and her punishment is to suck cum right out of my ass. And you'll hold her hair back as she sucks my boyfriend's cum from my ass."

Jennifer begins to pant. You can see her nipples get hard. You can see her whole body tense with excitement.

And your girlfriend continues "Then you're going to admit that you're equally filthy and deserve some cum too, and you're going to kiss her deeply, so that the cum slides onto your tongue and down your throat, and her lips taste her own twat on your lips. Then we're all going to go to sleep. And you're going to tell her that we started her off innocently enough, but tomorrow the real kink will begin."

Jennifer bites her lips. Her face is contorted by total desire, shock, maybe a little concern, as if Erin has just crossed her wires of horniness and sisterly love.

And Erin doesn't stop. "And as long as you two are under our roof you won't call each other by name. You'll call each other 'sister' or 'sis' or 'slutty sis'. Understand?" Erin looks over at you. You've never been more proud of how her mind works. And you've never been more surprised. Clearly this is a thought she's had before. Clearly this is a scenario she's played out in her mind. You wonder, who the sisters were during all those thoughts.

Jennifer steps toward Erin. She wants to engage. She's horny as hell and she wants it bad.

"No" Erin says, calmly but sternly. "Now you know what we want from you, if you want to live here. What do you have to say?"

Jennifer's whole body, her tiny breasts, her tight twat, her goosebump covered flesh, heaves. Her lip trembles. Just the thought of this has reduced her to jell-o.