For context I have 2 brothers on my mom's side I grew up with but when I was around 16 I found out my dad had more kids. I met my sister and brother from my dad's side and we almost all get along more than the brothers I grew up with. Since I can remember, I was always trying to do incestuous things out of just urge. I'd sleep in my mom's bed but I'd try and see her tits or whatever was easy access to try and see while she was sleeping, I was a kid who didn't really know it was wrong. I've even had some encounters with my mom but that's a different story. So my sister is very attractive and I have fantasized over her since we met but idk if she feels the same. The more we hang out and talk, the more alike we find each other. Idk how she feels about incest actually since everyone is forced to mask their feelings due to society. I had a wet dream last night where I was in a place I've never been in in general and my sister was there with me. We were sorting or looking for something and there was a small space we both had to sort of get closer to fit. And as we are talking we both stop and she takes her pants off and presses her ass against me. "I knew it" I said since we openly talk about sex stuff a decent amount. "Know what?" She asked as I was rubbing her ass. I couldn't answer as I was starting to cum. I woke up and cleaned myself off but had to write it down before I forgot.