Melissa's mom married my dad when she was 11, and I was 19, I was renting a suite in their (my parents) house, so we kind of grew up together. While we had our share of quarrels, we also developed a really good friendship. When ever she had a question about life or what to do about something as she was growing up, she always came to me. I think it was because I was always really straight forward with her. I didn't dress anything up and told her the facts straight out.
Melissa moved out of town about a year ago, when she was 19. She wasn't really that far away, only a couple of hours, so when she called me to tell me that she was going to be back in town for my father's birthday, we made plans to spend at least one night at my place talking about what's been going on in our lives.
On the night of my father's B-Day, my sister (by blood),her husband, my step-brother, Melissa, and I, all met up at my parents place for a family dinner. After the dinner and after presents had been opened, we were all asked if we would like to relax in the hot tub before heading home. My sister and her husband opted out as they had to work in the morning. My step-brother declined and decided to relax with a book instead. My step-mom was doing the dishes and cleaning up so this left Melissa, me, and my dad. So we all climbed in and relaxed among some idle chitchat.
After working out all day, my muscles were really sore, so I took full advantage of the opportunity to soak them in some hot water. My father only lasted about a half hour before he said he was tired and was going to go to bed. Melissa decided to stay in a little longer so we could talk about the day that we planned tomorrow. My father reminded us to put the cover on when we were done and lock the house door when we left. We said we would, wished him a happy birthday, and watched as he and her mom headed for their room. My step brother came out and said we were no fun so he was leaving too. Which left Melissa and me alone.
I suggested that we put half the hot tub cover on so when we were going to leave it would be easier for us to cover it up. Melissa agreed and we moved it into position. This left her and I directly across from each other, with not much room to spread our legs out, so Melissa put her feet up on top of my legs and mine went on the bottom of the tub. As we relaxed, the conversation fell quiet for awhile. I put my head back and dozed slightly until I felt Melissa's feet move slightly against my swim trunks. I opened my eyes and looked at her, but she had her eyes closed so I couldn't tell if it was accidental or not. I closed my eyes again and after a few minutes I felt her toes brush my cock, then move away. I opened my eyes again, and she still had her eyes closed. I decided if she was playing a game, I'd see how far she was going to go with it. So I closed my eyes once again.
Now I began to think of how much I'd actually like to fuck her. I mean, it wasn't like she was my real sister. She was a step sister, and a woman, and a pretty good looking one at that. So there would be no problem if I fucked her or not, right? My cock started stiffening at the thought of having my little step sisters mouth enveloping it.
My daydreaming was cut short when I felt her toes on my cock again. This time, instead of just brushing it, her toes curled and ran up the side of it slightly. Without opening my eyes, I said, "I think your hand would be better than your toes." Then I opened my eyes quickly and looked at her. Her eyes were wide open and her mouth open as if in shock. Then as she closed her mouth a little, I noticed that she was breathing rather heavily. I pushed her feet to the floor and moved closer to her. Reaching out under the swirling water, I took one of her hands ( that seemed to be between her legs) and placed it square on my cock.