“Why not?” you ask her.

"Because I haven't had a chance to sample you yet," she tells you as you slow down in your thrusting into Carrie.

"Oh no, not yet. You need to cool down, mister, cause I don't want you cumming in seconds." As she says that, your girlfriend rolls to her knees and leans into her naked sister. Their large breasts press together as they start to make out. Slowly you pull out of your girlfriend's cunt, fully intending on fucking Sam, but she pushes you away, and you flop onto the bed beside Carrie.

"Jesus fuck, that is hot," you say as they share their tongues. "I assume you have done this before?"

Carrie looks over at you and blushes. Sam smiles and says, "Watch for a moment and don't masturbate. I want to ride you." Sam then slides slightly down her sister's body to kiss her inflamed nipples gently.

Carrie moans at the touch of her sister's mouth, "Yes, kiss them all better," she purrs.

Sam pulls back slightly and smiles up at her, "I'm just practising for when you are pregnant. I am so going to milk you dry."

You moan at the thought as she goes back to sucking on your girlfriend's pierced nipples. You can't help yourself and lower your hand to your cock and start to softly stroke yourself. Sam's eyes dart over to you, and she leans sideways from her sister down towards your throbbing cock. You moan in anticipation as her mouth slowly envelopes your shaft and then a yelp as she bites you quite hard.

"Fuck," you exclaim, jumping.

"I told you not to masturbate. Next time I will bite hard," she teases.

"That wasn't hard?" you ask in astoundment. The imprint of her teeth could be seen on your shaft. Sam smiles, and Carrie laughs. There was something to that sound and look. Something shared between them.

"Just watch, and I promise you will get your turn," Sam says.

She goes back to pleasing her sister, kissing her breasts and nipples, gently taking the nipple hoop in her teeth and lightly pulling. Then she leans back up to Carrie's mouth and says, "So, Monday, while you are fucking Dad and our brothers, do you mind me making use of your boyfriend?"

"I insist," Carrie says back.

You shake your head, "You two are talking as if it's a foregone conclusion," you note.

As Carrie lowers her head to Sam's tits, Sam smiles. "Well, Dad and at least one of our brothers used to perve on us skinny dipping in our pool, so I think we have a good chance."

Carrie paused a moment and looked up at her sister. "And there was that time we played strip monopoly."

Sam laughed, "Yeah, we were all drinking, but Jacob got a little drunk and handsy."

"Handsy?" Carrie shot back, "he offered to wave your one grand debt for a blowjob."

"Yeah, but he ended up agreeing to just a picture," she laughed back.

Carrie laughed, "A picture which I took of Jacob's hands cupping your tits like he was a human bra."

Sam smiled, "Yeah, but it was worth it. You should have felt his erection on my arse. That boy is hung."

Carrie went back to kissing her twin, and they both moaned as you watched on. Your cock ached from arousal and the bite, but you dared not try and masturbate again.

After several more minutes of making out and groping each other, Carrie looks towards you. "He has been good," she says knowingly.

Sam smiles, "Yes, he has. Maybe he has earned something." She disengages from your girlfriend and crawls between your legs. As hear head approaches your cock you tense a little concerned about another bite. "Oh,": she says sadly, "looks like I bruised you with my last little love bite. Let me kiss it better."

You watch again, as if time stood still, as the mirror image of your girlfriend slowly lowered her lush lips to your cock. Slowly, gently she sucks on you, and you shudder, her mouth is so warm, so familiar, yet her technique is that of a stranger. "Oh God yes," you moan as Carrie moves to beside her sister.

"Is she good?" she asks you. You nod your head just as Carrie grabs a fistful of her sister's hair and forces her down onto your cock. The twin gags as you penetrate her throat, and you buck, shuddering. You feel her throat spasming around your cock and feel like you can't hold back.

Carrie pulls Sam's head back only a fraction just to push it down again, never letting your cock from her sister's throat. "I'm going to cum," you groan.

Carrie's smile broadens, and she pushes Sam down again and holds her there as your cock spasms and jerks in her throat. You feel Sam swallowing and moan again at the sensation of the twin swallowing your load.

Then Carrie lets Sam go, and she sits up. "You bitch, you said you were never going to do that again?"

You moan at the word again, "Oh admit it. You love being **** to take cum?"

Sam playfully slapped her sister's tit, "Yes, but I wanted to feel him fuck me."

Carrie smiled, "Well, you will just have to wait and don't worry, at some point, we can **** you to take his cum in your cunt as well. None of our friends know I've got my tits pierced. Maybe we can lock in the stocks and let our friends take turns at fucking you."

Sam moaned again and leant in to kiss Carrie, "Oh, that could be fun."

As your cock oozed cum you looked back and forth between the sisters, you couldn't believe what had just happened and what they were talking about. All your wildest fantasies when Carrie said she would do anything for you paled in comparison with what you had gotten this morning.