“It’s not a temporary visit”

It takes you a moment to process what that means... what that really means. In your moment, Carrie continues. “While you’ve been hatching your dirty plans with her, I’ve been hatching plans with her too. She said she didn’t want to be stuck living with Mom & Dad forever and thought it would be fun to move here. I told her we could go apartment hunting during her visit.”

Suddenly you’re not so sure how this affects your plans. “Isn’t that going to be kinda awkward?” You ask.

“What? Having a freaky threeway and then continuing to see her a lot?” At least Carrie knows what you’re getting at. “Probably. I guess you and her will just have to keep fucking.” Carrie smiles. You search her face for any sign of snark. All you find is sincerity. Is it possible that you have the greatest pervert girlfriend the world has ever known? “Look, once she’s got a taste for your cock, she’s not going to be able to quit anyway so she might as well move here.”

You get so hard just realizing that this is your life now. “You won’t be jealous?” You ask.

Carrie shrugs. “I was taught to share.” Then she adds. “But Cassidy is a selfish little brat, so we’d better get our plan right.”

So you do. You spend the next couple days formulating a dirty plan and then Cassidy arrives.

She wears a tight black dress, the sexiest you’ve ever seen her look, and you know it’s for you. Carrie knows. Only Cassidy doesn’t know that this is all one big plot.

The three of you hang out on the first night of her visit, talking, laughing, drinking wine.

Carrie and Cassidy joke with each other and reminisce childhood stories like siblings always do. You just can’t imagine what’s to come will really truly happen.

But you can see it in Cassidy’s eyes every time she looks at you. You see the gaze of a girl who wants you... bad.

Per the plan you casually mention that you have the next day off work and Carrie mentions that she doesn’t.

She nudges her sister. “You could hang out together if you don’t mind being bored all day.”

“Ha ha ha,” you faux tease her and she rises and escapes to the bathroom for a quick moment.

Suddenly Cassidy is upon you, her hand reaching under her thighs dress, then holding two wet fingers up to your lips.

Without a word you slip them in your mouth and taste her. She tastes great, just like her sister does. You can’t even believe you’re in a position to make the comparison.

“All fucking day tomorrow.” She whispers to you with gritted teeth.

But what’s happening between the two of you doesn’t need to be spoken. It’s intense and primal, more even than how you and Carrie got together.

“I miss anything?” Carrie asks when she returns.

“Nope. Boring.” Cassidy winks.

You stay up late having a good time, socializing, innocently. You get to bed at 3am and certainly don’t expect Cassidy to be knocking at your door at 7am the next morning. But there she is.

You’re groggy and kinda gross looking. She doesn’t seem to care. As soon as you open. The door her tongue is in your mouth. You taste her juices on her own lips. Her hands reach down into your pants and find your cock.

“I didn’t sleep” She says breathing heavily. “I was up all night rubbing off to you. Those messages you sent me. Those things you asked of me. I’ve never been more turned on in my life.”

You take a deep breath. No time to be sleepy. This is really happening.

Your pants are down around your ankles. And your member is thick and throbbing, pointing up at the ceiling.

Cassidy is wearing a big T-shirt and shirt shorts, possibly what she wore to bed (but not to sleep) overnight and quickly you help her tear them off.

It’s all happening so fast, you barely have a moment to take in your girlfriend’s sister’s naked body, her perky tits and small pert nipples, her wet bald snatch. Suddenly you’re back on the bed and it’s being lowered onto your cock.

It grips your cock and doesn’t let go. She bounces on you and her tits, big b’s or small c’s, something like that, bounce with her.

She groans and moans, a deep guttural moan that evolved into a loud screaming. Her hair flings in every direction. She’s in ecstasy and you feel pretty good too.

It doesn’t take long for the whole room to smell like sex. It’s really happening. You’re fucking Carrie’s sister. You’re fucking her stupid.

Over the sound of her moaning and screaming she doesn’t hear the sound of your front door open. But you do. You’re expecting it. It’s all part of the plan.

In fact she doesn’t realize anything is amiss until Carrie walks into the room declaring “they said I could take the day.... WHAT THE FUCK?!”

Cassidy’s eyes open wide. She screams and jumps off your wet cock and falls, naked, into the corner of the room. “Carrie... I... I...”

You can only imagine Carrie’s delight on planning this all out and putting on this show for her sister’s misery.

She’s doing a good job too. Her face is red with anger or maybe arousal. She just glares at her sister.

“Carrie... I’m sorry but he...”

“Shut up!” Carrie snips. Then slowly she starts to undo her belt, unbutton and unzip her slacks.

“What... what are you do..”

“SHUT UP!” She pulls down her pants, panties too. And now she’s bottomless in front of you and her sister. Methodically she climbs on top of you, lowering her own wet slit into you, like Cassidy did, but reverse cowgirl so Cassidy can see it all. “I want you to see it. I want you to watch.” She says.

And Cassidy does. Her eyes are glued to the spot where your cock, wet with her juices, pushes into her sister. She stares at it intently as you fuck.

Carrie pants heavily as she bounces and you thrust. And Cassidy just stared. It’s the most beautifully, awkwardly, erotic moment of your existence. The reality of it alone makes you want to explode.

It seems like the moment lasts forever and it seems like it ends immediately. As soon as Carrie comes off your cock, Cassidy lunges in your direction, as if it’s her turn. But she stops herself, licking her lips, then looking at her sister, as if asking for permission.

“How bad do you want to suck it?” Carrie laughs in delight

Cassidy doesn’t answer. Instead she bites her lip. It’s clear she has it bad.

“Ask me to tell you my secret first and I’ll let you.” Carrie leans in close to her naked sister.

“Tell me” Cassidy whispers back.

And you’re surprised that Carrie is going to spill the beans already. She’s going to admit that this has all been one big manipulation.

Turns out it’s a different secret she has to share. One that takes you by surprise.