Collaborative sex stories let us write the plot together

(Her Secret Fantasy, continued by RandomShadfan...)

“Do you want a drink or something?” you ask your step-sister, trying to be friendly. “It might help ease the shock of what we tell you.”

“Sure,” Amy replies, looking confused “Do you have any red wine?”

Rachel darts from the room to the kitchen. She knows where the expensive alcohol is kept better than you. “So, what did you drag me out here for?” your sister asks.

“Like I said, it’s better if you have a drink when you hear it. I’m sorry to run you around like this but it’s a necessary evil,” you apologize.

Your sister clearly isn’t impressed. Your girlfriend comes back into the room and hands Amy a glass of red wine. Amy takes a sip and says “Okay, what’s the matter?”

Rachel starts off. “Well, Amy we’ve been best friends since forever. Lately, I’ve been wanting to scratch an itch that I need your help with.”

Amy looks more confused still, so you just come straight out with it. “Amy, Rachel wants to have a threesome with you and me.”

Now your sister looks like she’s been slapped in the face with a fish. It’s almost cute. “W-what?” she asks, shocked.

“You know those times that you told me you had with Ross?” Rachel asks her. “In university?”

“Rachel, that was then!” Amy replies, still shocked at the prospect of a threesome with her best friend and her step-brother. “A lot has changed since those days.”

You decide to speak your mind. After all, it worked when you met Rachel for the first time.