Catching Each Other

This story happened when I was 19. My mom died in a car accident when I was 12. Five years later my dad married Susan, whom he met at church. A year after they married, my sister was born. Susan was 42 when this story happened. Susan is a great person. She is very patient and kind. She had a great career when she met my dad, but gave it up because she wanted to focus on being a wife and mother. She is 8 years younger than my dad. My dad adores Susan and treats her like a princess. Susan and I got along, but we were not that close at first because I felt she was trying to replace my mom. I thought Susan was really attractive. She is 5’7”, curvy and a little overweight. She has long brown hair, nice legs and huge breasts. I looked at her bras once and they were size 34DDD or 36DDD. She usually wore a skirt or dress that highlighted her best features. Susan and my dad were very affectionate and had sex often. Sometimes when I was trying to sleep I could hear Susan through the bedroom wall moaning with pleasure. Listening to and thinking about Susan having sex really aroused me. One day I got home much earlier than usual because my instructor was ill and cancelled class. My dad was at work and my baby sister was napping. When I entered the kitchen, I saw Susan in the other room. She was grinding the arm of the couch! She was topless with one leg on the ground and the other on the couch. Her bra and panties were on the floor next to a basket of laundry. She was wearing a blue skirt but had pulled it up in order to grind the couch. She put a pillow case on the arm of the couch so that it did not get wet. She was leaning slightly forward with her face down and hands on the couch arm. Her dangling breasts jiggled and swayed as she slowly grinded the couch. She was breathing heavily and occasionally moaned. Her eyes were closed and she did not notice me. I stood there and watched her. It was the first time I saw a naked woman in person. She was so beautiful! After about a minute, Susan opened her eyes and saw me. She quickly covered herself with a towel from the laundry basket and asked why I was home so early. I told her that my class was cancelled. I could see that she was very embarrassed. I turned around and walked to my bedroom. When I got to my bedroom, I closed the door and quickly prepared to masturbate about Susan. I got a shoebox out of my closet and put in on my bed. The shoebox had porn magazines and a bottle of lotion that I took from Susan. I pulled down my pants, got in bed on top of the sheets, applied the lotion, closed my eyes and started touching myself while thinking about Susan. About a minute later, I suddenly heard a sound. When I opened my eyes, I saw Susan standing in my bedroom. In my rush to masturbate, I forgot to lock the bedroom door. She was wearing the blue skirt and one of my dad’s sweatshirts that she had just washed. She stared at me and asked what I was doing. I quickly covered my penis with a pillow, put my head down and sat quietly on my bed as she continued to stare. I usually felt guilty when I masturbated back then, but being caught by Susan filled me with shame. Susan then noticed the lotion and magazines. She sarcastically asked why I had her lotion. She then realized that I was not looking at the magazines while masturbating. She asked what I was masturbating to. I sat there silent. Susan then asked if it was to her. I meekly nodded. Susan looked surprised briefly, but then seemed to realize the power she had over me. I was 19 and thought about girls all the time. But seeing my mature stepmom moan as she grinded the couch was overwhelming. It was a teenage boy’s dream come true. Because of that, she was in full control of the situation. Then Susan said something I did not expect: she asked me if I needed to finish. She then said that she needed to finish, too. She told me to put down the pillow and stand up. I resisted for a few seconds but then stood in front of her with my flaccid penis. She then said to finish. I gave her a puzzled look. In response she raised her voice and ordered me to finish. I replied that I would need to first get excited again. Susan then suddenly took off my dad’s sweatshirt, exposing her breasts. Because she was breast feeding my baby sister, her breasts were bigger than normal. They sagged a lot but looked full. Her areolae were much bigger than those of women I had seen in magazines. I started getting erect almost instantly. Looking at my twitching penis, she smiled and said that I was a breast man just like my dad. She then picked up the lotion and put some on my hand. Her breasts jiggled as she moved around the room. Using the lotion, I started stroking my penis. As I did this, Susan stood in front of me smiling. I felt humiliated stroking myself as Susan watched but I was so aroused that I could not stop. It felt so good! I stroked faster and faster. After about a minute of stroking, Susan took off her skirt. She was now completely naked. She walked over to my desk chair, turned it towards me, sat down and spread her legs apart. Her pubic hair was trimmed back enough that I could see her vulva well. It was wet, probably from grinding the couch and exposing herself to her stepson. She was preparing to masturbate. I came not long after Susan sat down. As I came Susan smiled and laughed a little. She then stood up, collected her clothes and said that she would finish in her bedroom. The next day, we sat on the couch and talked. Susan said it was normal for teenage boys to find adult women attractive. She smiled and said she was flattered that I thought she was still attractive enough to masturbate to. I just smiled back, but I was surprised that she did not realize how beautiful she was. She then told me that the day before was a one-time thing because she realized that she only felt comfortable being naked with my dad. Susan apologized when she saw that I was disappointed. Susan then shared her thoughts on masturbation. To my surprise, she told me that she masturbated almost every day before marrying my dad and still did sometimes. She said that sex is best when two people are fully committed to each other and trust each other enough to me completely vulnerable. If I was not in a marriage relationship, masturbation was better than sleeping with someone I did not love and fully trust. I now have a career, family and beautiful wife of my own. But I still sometimes get aroused thinking about Susan grinding the couch or sitting in front of me naked.