The first time with my sister happened when we were teens. I was stroking my cock after a shower. I had left the door open a bit, and I saw her watching me. She was staring at me jerking, and I didn't want to stop. I said, "If you want to watch, come in." I thought that would make her leave, but instead she came in and watched.She just sat there and watched my stroke my cock.  After a bit she reached out and touched the head of my cock. I was so hard and turned on that I asked if she wanted to stroke me. She did, and I started rubbing her little tits and tight ass. She was moaning softly. Then she leaned down and started sucking me. I didn't last very long at that point and came quickly. She wasn't sure what to do so she swallowed my cum. After that, we cleaned up and didn't speak of it for a while. But I hoped more would happen in the future

I'm so hard thinking about it right now

My sister later :)

After the first time my sister and I fooled around, we talked a few times about it. Then, about a week later I went into her room to talk while she was lying on her bed. We lay next to each other and soon started talking about kissing and making out. That started it, soon we were kissing and I was rubbing my hands all over her slim body. We took off our clothes, and I started kissing down her body. When I reached her pussy, I stated licking and kissing her....After a while she started to stiffen up and I knew she was cumming. She then sat up, grabbed my cock, and started sucking. She licked my cock from balls to tip, it was amazing.  I lasted longer this time, and when her hot mouth made me cum, I shot all over her little tits