“We should invite people to join us.”

In a way it was always headed in this direction. It would never be enough for Carrie and Cassidy to simply go out and kiss and dance in front of others. There was always going to have to be more.

“Can you imagine someone fucking us and having no idea what we are?” Cassidy asks, her tit being groped by one of her sister’s hands as her asshole is fingered by the other, as you jerk your cock in the direction of her pretty face.

“Yes. I can imagine it. I have imagined it.” Carrie responds.

Truth be told, so have you. So has Cassidy. And so it’s agreed you’ll take turns inviting new friends into your crowded bedroom. For a split second you wonder if strangers might be hesitant to join an established threesome. Until Carrie aptly observes “I think we’re so sexually overwhelming, no one will be able to say ‘no’”

Cassidy goes first. Turns out she has a crush on one of the strippers she works with. A sultry vixen named Tiffany who agrees immediately to join the three of you. You go out for a night of shots and then back to your place where she immediately strips naked and declares “come and get me” in classic self-obsessed stripper fashion.

Of course you do.

Though as you thrust into her doggie-style, her tits jiggling beneath her, her sweaty hair flinging back and forth, you see her looking jealously at Carrie and Cassidy as they 69.

Later she observes “I don’t think I’ve ever seen two girls happier to be eating each other out.”

“Have you watched lots of girls eat each other out?” Carrie asks.

Tiffany shrugs proudly “yeah.”

And you can tell Carrie is feeling competitive for slut bragging rights. “Yeah? How many orgies have you been to?”

“How many have you?”

“Seventeen.” Carrie beams with pride.

“Thirty five” Tiffany counters.

How badly Carrie must want to brag “Well have you ever fucked your own sister in every way imaginable?” But she doesn’t. She just shoves her fingers into Tiffany’s asshole until she yelps.

A month later it’s Carrie’s turn and she invites a woman named Maeve from one of her yoga classes that she’s had her eye on. But she’s playing it cautious “A woman like that,” she says “late 40’s and still gorgeous and rich as fuck she’s either needs some loosening up or has had lots of loosening up.”

Turns out it’s the latter.

“I just love cock. If these two chicks are part of the deal, fine whatever” Maeve says as she pulls down your pants, slips your thick member out of your boxers and slips her lips around it.

And it’s clear that she’s a woman who had dined out on her love of cock plenty. She practically wraps her tongue around your thick meat as she thrusts her mouth down into it.

After a few minutes of her drool covering your rod, she relents and let’s Carrie have a go. But even as Cassie whisks up to herself, her fingers rubbing at her clit and her tongue slobbering over her nice, solid tits, she stares at your cock thrusting between Carrie’s lips, coveting it for herself.

She doesn’t seem to have much interest in the girls, though she doesn’t mind letting them grope and lick her as they like. When Carrie slips her mouth off your hot member, she lunges toward it again.

“Hey, don’t I get a turn?” Cassidy laughs.

Maeve rolls her eyes playfully “You sure you wouldn’t rather lick Agnes?” Having no idea she’s just invited the girl to lick up her own sister.

So Maeve gets more time with your cock. Eventually you cum down her throat making her cough, but not to her surprise. Not since she looked up at you at one moment and declared with matronly authority “I want you to cum down my throat, understand?” So, yes, you were only trying to politely fulfill a request.

A month later it’s finally your turn to pick someone and you decide, maybe as an unconsciously counterpoint to the two slutty ladies in your life, to go with Annie, the girl who lives two doors away and who is, for lack of a better term, a total sweetie.

Not in a way that seems boring or prudish, but in that she’s the sort of girl whose idea of a fun night is drinking wine and playing Scrabble and Pictionary late into the night. You know this because a few months ago she invited you over for a big gaming party where you did just that.

So you invite her over for a night of Scrabble and Merlot.

And at some point, several glasses of wine in, she looks at the three of you, a glare of realization flickers in her eyes and she wraps her hand over her mouth to suppress a shocked laugh. Then after a deep breath she says it with certainty “you invited me over here for sex, didn’t you?”

Carrie scoots close to her on the couch. “Have you ever had a foursome before?”

Annie laughs. “What? No.”

“Threesome?”

“Of course not.”

“Ever been with another girl?”

“I swear I haven’t” Annie takes a nervous sip of her wine. “I mean I haven’t really given a lot of thought to the idea. No one has ever offered.”

Cassidy joins them on the couch, making the space quite tight. “What if we’re offering right now?”

Annie doesn’t respond immediately. But she wears a big nervous smile. She looks at Carrie and at Cassidy and at her scrabble board.

Carrie leans in and whispers something to her and Annie laughs loudly, lowering her head so her hair falls awkwardly and sexily in her face. Then finally recovering declares “Yeah, okay, let’s do it.”

Carrie and Cassidy undress her methodically, slipping her shirt over her head, revealing an unsexy bra, then that off too revealing big nipples and goosebump covered breasts. Then the undo and slide down her jeans as she giggles with nervous excitement, revealing a cute, bushy twat. They lay her down on the couch, Cassidy curling herself up between her legs and starting to lick at her pussy, Carrie straddling herself above Annie's face, pulling up her skirt to reveal her wet, uncovered twat.

Annie looks up at it with a wince. "I don't know what to..."

"Just do what comes naturally." Carrie softly suggests and Annie leans in to lick.

You watch for a while, Carrie grinding her crotch into Annie's face and Cassidy grinding her face into Annie's crotch. But only for a few minutes before you walk over, unzipping your pants and pulling out your meat to join in the fun.

Annie pulls back from Carrie's pussy and smiles at it. "Oh thank God, I know what to do with this one." and slides her mouth around it. She's good at it. Maybe not wildly experienced, but eager, and listening to her slurping on your cock while moaning as Cassidy eats her out is heavenly.

Eventually Carrie joins her sister, the two girls jockying for position between Annie's thighs as she licks your cock like it's a lollypop.

You end the evening by fucking all three girls, hard and deep, finally pulling out of Cassidy's cunt and jizzing all over her tattooed tits.

"Do what comes naturally." Carrie says again to your guest and Annie leans in to slurp up all the jizz.

A few days later you awaken to a note slipped under your door that reads "Any time you want to again." You and your girlfriends know you've done well.

And yet, still it feels like things could be filthier. Maybe this is just the way you feel now? Maybe you'll always want more twisted fucking. But if that's the case, Carrie and Cassidy feel the same. As you sip beers one night, watching TV, Carrie gently fingering her sister, Cassidy can't help but make another kinky suggestion.

"I have something else to suggest. I've been thinking a lot about the three special girls we've been with and well I keep asking myself something over and over."

You and Carrie are eager to hear what that might be.

Cassie smiles at you. "Do you think any of them have a sister?"

"I don't know." Carrie answers. "But we should ask."