Your girlfriend begins panting. "You okay, babe?" you ask.
"Oh, I'm just horny," she says.
"Huh. I feel horny as well."
"Why don't the three of us have sex?" your sister suggests.
"Won't it seem weird for us two to have sex, sis?" you ask.
"If you're worried about us conceiving inbred children, let me remind you that I have your penis, and you and your girlfriend have her vagina. So technically, it's not incest."
Your sister is right. "OK, let's do it."
The three of you take your sister's remaining parts and sneak upstairs. Luckily no one sees you three. You all place your sister's leftover parts in her closet, then you head to your room for the three of you to hump. While your sister is locking the door, you and you girlfriend try your best to lay your shared centauress body on the bed. Your sister then strips your clothes and playfully plays with your penis. "It's time," she says.
Your sister jumps on you and your girlfriend and lets her penis enter your and your girlfriend's vagina. Your and your girlfriend's back legs wiggle as you are both being plowed. Your sister rubs her male hands on your and your girlfriend's breasts - all four of them. Your sister also spanks your shared centaur ass. You and your girlfriend do the same for your sister's male ass. The orgy ends with the three of you laying on the bed, all smiles.
"That was fun," your sister says.
"Is this what the inventor of the guillotine predicted?" you ask.
"I doubt it," your girlfriend says.
Your sister then gets up, saying that she now wants to...
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