"I know you've fucked all my boyfriends"

You're shocked to hear Carrie say it. You're not even sure what it means... like, if you should take it literally. But you suspect it's the key to everything that's happened so far and possibly everything that will happen.

Cassidy is shocked to hear it too. Her jaw drops, and Carrie immediately grabs her head and thrusts it onto your hard, wet, cock. And as Cassidy's lips glide down your Carrie-covered cock, your girlfriend continues to explain.

"Maybe not literally all of them, but all of them that you could get your greedy hands on. A couple girlfriends too." She snips. Cassidy moans but she can't retort with your meat deep in her mouth. "That's how I know it would be so easy to ask him to seduce you."

Cassidy's eyes bulge wide as she realizes this whole thing has been a setup. She realizes that whatever she thought was going on here, it's different. And the truth is, you sorta realize the same, but you suspect it will be in your favor.

"And I've asked myself." Carrie continues, "Why would you want to fuck all my boyfriends? What is it that they all had in common that appealed to you? I wondered this for a long time. And finally I realized the answer."

She takes her hand off her sister's head, letting her relent and pull her lips off your cock. But she still can't respond. She's panting too heavily, a mix of her spit and your precum drooling from her lips.

"What they all have in common is that they've all been inside me. And that's what you've always wanted, isn't it?" Carrie smiles.

Cassidy takes a second to realize what her sister is truly saying, then responds. "But... you're my sister."

Carrie reaches her hand over and caresses Cassidy's neck. "I know... it's twisted. But if it's what turns you on... who am I to judge?"

Cassidy doesn't like this new development. You can see it. "No... I mean... what exactly are you accusing me of?"

You see complete and total confidence in Carrie's face. "This one time I was fucking my boyfriend... you were probably listening from your bedroom... and almost as soon as he came in my, he took his messy cock next door for you to fuck. Do you remember Jake?" Cassidy doesn't respond. She falls into deep thought. "How about Frank?" Carrie asks. "Remember him? Or Bill, or Duwayne? You've always wanted them while they were still covered with me. And it's because what you've always wanted... all this time... was to taste me."

There's a long silence. Your thick cock still points at Carrie & Cassidy's faces. You could easily interject yourself and get their sisterly lips around it, but this is a moment for them... this is a moment when something important is happening.

"Tell you what." Carrie offers. "If you can admit to me that you've never ever... not even once... rubbed yourself off while thinking of my wet cunt, then I'll leave right now. I'll get up and go and you can fuck your brains out on my boyfriend's cock and I won't even be mad. All you have to do is admit it."

More silence.

"Okay. Fine." Carrie stands as if she's going to leave. But you know she's too smart for it.

"Wait... stay." Cassidy deflates. Her naked flesh begins to tremble.

So Carrie stays. "Admit it." She whispers to her sister, suddenly seeming very caring and nurturing. But Cassidy is hesitant. So Carrie, still only bottomless, helps her along. "unbutton my blouse." she says.

Slowly Cassidy reaches over, her thin fingers shaking wildly, and undoes one button at a time, until her sister's blouse slides off her shoulders and her amazing tits are there before her.

"Do you want my nipples?" Carrie asks her sister.

"Yes!" Cassidy declares and with total permission leans in and begins to glide her tongue over them. They're instantly erect, aroused, and within moment drenched in saliva. Cassidy licks at her sister's nipples as if they're the greatest ice cream treat of her life.

Your cock throbs just watching it. Watching and listening to Cassidy moan, Carrie groan, their fingers finding their slits. You feel like you could explode just observing them.

Finally Cassidy pulls back, a strand of saliva stretching from her tongue to her sister's nearest nipple. She looks up at her sibling like an obedient puppy, waiting for permission for what she really wants.

Carrie gives it to her. "Do you want my pussy?"

"Yes." She whimpers, happy, but almost seeming like she knows she's lost to her deepest most perverse desires and there's no going back. She buries her face in her sister's crotch and begins to lick.

Carrie leans over and licks her tongue up your cock, from the base to the tip. Then smiles at you proudly. "I don't blame her. I do taste amazing."

And then what happens? Well, the next day Carrie doesn't take her sister apartment hunting. Instead all 3 of you go... looking for an apartment big enough for three.

"Of course we're all going to live together." Carrie says, four fingers deep in her sister. "This is just the beginning."

"How?" Cassidy asks, five minutes later, as she jerks your hard cock and tangles her tongue with Carrie's. "We can't live like this. We look like we're related. People will notice?"

"So what?" Carrie asks ten minutes later, letting your cum ooze from her mouth onto her sister's face."

"I know how," you say... a dirty thought suddenly popping into your head, finally feeling like you're able to contribute to this insane, taboo, debauchery. "I know exactly how we're going to live together."