Collaborative sex stories let us write the plot together

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

When she gets off the phone, Monica exclaims, “I just got off the phone with your step-sister Amy, and she’s on her way here right now to join us. All I told her is that we’re having a small pool party, so how about we get fixed up and hold the fucking until after she’s here?”

You and Rachel agree. You pull out of her slowly, causing your cum again to leak out into the pool — both loads of it. You all find your swimsuits around the pool and put them on, and you make small talk while waiting for Amy.

Eventually, you hear a car pull up out front and soon enough, your step-sister is walking out to the pool, in a striking but also teasing swimsuit — a small bra with stringy bottoms, all black.

When she walks up, she steps into the pool and joins your conversation. You ponder how to start the action.