“I’ve been talking to my sister,” she says.

You start slightly, “Sam? Your twin? And you are telling me this while you are riding me because?” you ask.

She smiled, “Sam was telling me how bad a girlfriend I am for not guaranteeing you a child that is your own,” she pouts.

You lean up and kiss her, “Oh babe, you are the best girlfriend; I couldn’t ask for anything more.”

“Are you sure? Cause she needs a place to stay and is broke, and well, we share DNA.”

You shudder and feel like you are going to cum but hold back. “Are you suggesting that I should fuck your twin sister?”

She leans into you and kisses your neck, “No, I’m suggesting you have a child that share’s both your and my DNA, and Sam has said that she is more than willing.” You groan and grind into her, “What do you think? Do you want to have Sam live with us? Rent-free? Paying for accommodation and food with her body, exclusively for you?”

You shudder at her words, “Really? Because I want you to be a slut and risk getting knocked up by someone else, you and your twin have planned to let me knock her up?”

Carrie bites her lip, “Well, yeah, I have the opportunity to fuck around and risk getting pregnant. What kind of girlfriend would I be if I didn’t let you do the same? She’s not on the pill but is unsure if she wants to go on fertility treatments. And her nipples aren’t pierced. I hope that is alright for you.” You reach up and squeeze Carrie’s tits. “Oh, that hurts a little. I wonder if that’s the **** working or just a little tenderness after the injection?”

“You’re really going to let me fuck your twin sister?” you ask her.

She leans forward again and whispers in your ear, “If you do well, maybe you can have two sluts fucking whoever you like under your roof. But for now, yes, her cunt will be just for you if you agree.”

You roll her over, so you are on top and lift her legs up. You push them back knowing her flexibility, “I bet she’s not this flexible,” you say as you push Carrie’s knees to either side of her head.

She moans and bucks against you, “No,” she pants, “I hope you don’t break her.”

You groan again, “I think you want me to break her?”

Carrie grits her teeth through a moan as you feel her contract around your cock. “Maybe,” she pants.

You laugh, “Tell me what you want, and I will make you cum,” you promise her.

She breaks eye contact as she moans, “Use her, roughly, fuck her, break her, make her beg for you to be rougher. Make her beg for you to turn her into a fuck slut.” Her pitch raised as she continued. “Bend her in ways she can’t and plant a baby in her fucking cunt,” she screamed.

You moan at her words, “Too bad she’s not here right now,” she says.

Suddenly you feel hands on your back, and a hot whisper caresses your ear, “Who says I’m not?”

You shudder and shake on the brink of cumming before your girlfriend’s twin digs her nails into you. It is hard and draws blood immediately. “You can’t cum yet,” she says as you shake.