I've lost a lot of my old bookmarks over a few moves and transitions, and I recently remembered a few stories from a long time ago that I would love to re-read. There were three of them:
The first was a multi-part story that I'm pretty sure was on Literotica though I couldn't find it when I searched for it. It was about a guy who was at a cabin for a vacation with his family and had sex with his sister? cousin? and her cheerleader friend. One of the scenes was the three of them having sex in the lake. I think in later parts the story expanded past the cabin but I really remember the earlier section the best.
The second story I don't really remember much at all, I remember reading the very beginning and thinking it was promising but I can't remember past that. It was two sisters, twins I think, who had suddenly become very interested in each other. I remember there was a long, purple-prose-ish section describing their appearance. I think they eventually banged a pizza delivery guy? I might be making that last part up.