Collaborative sex stories let us write the plot together

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

“Well… you see…” Rachel begins, “I gave Ross the blue pill, which has kept him hard all day, so I called Monica over to help out, because I was getting too worn out. Well, now we’re worn out and would like to watch some action. I know the history you have, so I don’t see a problem with you fucking your step-brother.”

“Oh… I see…” Amy replies. As she’s standing in the pool trying to process the situation, you swim over and start to kiss her. She’s hesitant at first but eventually kisses back. While you’re kissing, you reach around and release her bra, springing her nice boobs to freedom.

You move down so suck on a nipple as she’s stroking your hard-on through your swimming trunks. Little do you see she’s also untying them. With a sudden yank, your swimming trunks are gone, freeing your hard dick. Amy gasps and strokes your cock as it’s underwater.

Rachel and Monica are watching the action as they are now completely naked and fingering themselves.

You pull down Amy’s bottoms, revealing her shaved and (as you know from experience) tight pussy. You reach down and rub it, releasing a moan from your step-sister. You then take your cock and place it at her entrance, sliding up and down her slit before you start to push into her.

She moans and brings you in to kiss her again. When your kiss is over, you start thrusting in and out of her. She moans some more, still very tight around your cock.

Amy’s moans start increasing, and she starts saying, “Yes yes yes ugh it feels good!”

The feeling is there, so you slam into her once more and release all the seed you have deep into her pussy. This causes her to squirt all over, and the feeling is amazing.

When you two are done, you sit there, panting and staring into each other’s eyes. You can’t tell if you spot lust or worry in your step-sister’s eyes.