When my Mom and Dad got divorced, Dad married a woman named Clara, who had a daughter, and we became one of those blended families. My stepsister, Joanie, was 20 and I was 18, so there was a period of awkwardness in the house for a while but nothing too bad. She was very attractive in my eyes, and a bit of a quiet bookworm type.
My attraction for Clara was somewhat unhealthy, as I fantasized about her constantly and whacked off thinking about her. Any time she hugged me, I felt oddly aroused and would use those interactions to fuel my masturbation sessions.
Joanie was in university and was home for the weekend, when there was a huge storm that lasted 3 days and nights. The most rain in a hundred years or something they said. The first night of the storm, the lightning was flashing and the thunder was rolling loudly. I had gotten up because I thought that the storm was a pretty wild experience, and it had been going on for a while.
I was watching it from my room and I thought that maybe a view from one of the other windows in the house might be cool. Sneaking through the house, I looked in the rooms that I was passing. My room was on the second floor and Joanie's room was too. When I was about to pass the den, which was just down the hall, I noticed some movement and when I stopped to look, a flash of lightning came through the windows and lit up the room.
My Dad was on the couch which faced away from the door and to the right, so I could see the side of his head. The unreal part was that my stepsister Joanie, was bent over with her back to me, her face in his lap. I couldn't see any of what was happening there because of the positioning but it was easy math, even for someone as inexperienced as me. My dick swelled immediately.
The part that I could see was that my Dad had his arm stretched out to his side, and Joanie's nightgown was up over her waist. Her panties were down near her knees and Dad was fingering her pussy. When the lightning flashed, it didn't light up my view of things, and it took my eyes a few long seconds to refocus on it, as I was locked on to that picture. There was no direct light on her ass so I didn't have much of a view anyway, but it was like I thought that if I looked harder, that I would see clearer.
I didn't want to get caught watching, but I didn't want to miss what happened next, so I stayed. The groaning coming from my father told me that he was coming, and he fingered her pussy harder as he let loose. Occasionally I could hear sounds of him fingering her and my penis throbbed. After only a minute or so, he got up and started straightening his clothes, so I disappeared into my room again, leaving the door open a bit.
As they passed, I heard them and I looked out. Dad was groping her ass and he looked to be almost supporting her weight like she was sick or something. It was a strange night. I thought about it for a long time and jacked off thinking about it.
Why would Joanie be having sex with Dad? I knew that my step mom was on sleeping pills almost every night and that Joanie was a hot girl. It was also not lost on me that Dad would also think that she was hot. So, a temptation? I'd say that she was.
This began a bit of an obsession that I had with Joanie, so my focus shifted to her from Clara. How could I have sex with her? Was Dad going to split up with my step mom to be with Joanie? How long had they been doing it? Many questions ran through my head, but the most dominant thing was that I couldn't look at her without thinking about fucking her.
The next night, it was still storming, and I was on high alert keeping an eye out on the hallway. When Joanie appeared, I was already watching. Her expression was strange, like she was looking through everything. When she was past my room a ways, I was still peeking out and I saw Dad meet her. He was quiet and just turned her into the den. She walked a bit stiff, like a hypnotized person would, or what I had thought a hypnotized person would walk like.
Waiting a couple of minutes or so, I was bursting with anticipation and I went to the den door carefully, listening to the thunder. When I looked in, I saw that Dad had Joanie sitting back on the other couch there with her legs spread. His back was to me and his face was in her crotch. This was pretty wild to me and I was sure that he was going to fuck her. My erection throbbed in my pajama pants.
Anyway, I was curious, so I snuck down to the main floor to Dad's room and looked in. Sure enough, my step mom, Clara looked zonked right out of it and she was snoring. That was the indicator. If she was snoring, she was on sleeping pills. If she wasn't snoring, she was just sleeping normally. I stroked my erection and was tempted to stay a little as she was very lightly dressed and the covers were just over her legs. She had been the object of my fantasies for a long time before I encountered Dad and Joanie.
As I left Clara snoring, I headed back to the door of the den and looked in, Dad was standing in front of Joanie, who was still seated and he was definitely putting his dick in her mouth. The next night, the storm continued and the same thing happened. Joanie walked down the hall, Dad steered her into the den, and I watched as he played with her pussy and got a blow job.
I never knew what this was all about, but I watched the hallway a lot. I even had a tiny photocell that I put in the hall that would light a little LED when someone passed. That little device came from a box of spare parts that was in the garage which Dad had got from a factory where he used to work. The only times that I saw things like that between Joanie and my Dad, were on stormy nights, but it was every storm so I saw it probably 5 or 6 times.
He never fucked her that I saw. He always just did his thing, groping her, sometimes eating her pussy and almost always put his cock in her mouth, then led her back to her room while groping her. In my fantasies, I fucked her and the number of times that I pulled my cock and shot my load thinking about pumping it into her was incalculable.
Fast forward a few months and Joanie was home from university for the weekend again. Dad was away on a business trip and decided at the last minute to stay the weekend, then return Monday. A storm rolled in that night and suddenly, I remembered the stormy nights that Dad would fool around with Joanie. At night, I snuck down and saw that Clara was snoring away so I went back to my room and to reading, but a while later when I saw the LED light up, I bounded to the hallway.
When I got to my door, Joanie was just passing, so when I opened it, I whispered "Joanie." I got no reply, "Joanie!" No reply. I walked past her and looked at her. "Joanie." I said. It was so weird. Like she was really groggy.
