My mom and I had lived alone since my dad left when I was 5. She was a great mom and we were always close growing up. Even though she wasn't the super hot ridiculousness that you read about so often on Literotica, she was beautiful in her own way.
At 54, mom took care of herself but was pleasantly plump with a great smiling disposition and a wonderful set of tits. While most boys my age fantasized about waifs in catalogs, I found older women, especially my mom to be particularly alluring. I had spent many a night beating my meat to thoughts of her and had taken to looking for her used panties to smell while I jerked off.
Historically, I had taken showers at night before bed, but shortly after I turned 18 I started running in the morning to stay in shape and would shower after I got home. It was then we started to develop an interesting pattern. It seemed my shower time coincided with her time to collect laundry and start the washer.
It started with a knock on the door when I was in the shower. Mom would knock gently and ask if it was ok to come in and grab the dirty clothes. The first morning I told her I'd be out in a second. Id did the same thing the second. The third morning, I told her to come on in and grab them.
We had an older shower curtain that was a solid color but pretty thin. You couldn't see through it unless the shower light was on and the rest of the bathroom light was off and even then only vague shadows. I could hear her open the door, grab up the clothes and quickly leave.
The next day, I was hard and had butterflies wondering if mom would come again today. After a few short minutes, there came the knock and I told her that she really didn't need to knock; she could just come in since it was my change in routine that messed up her morning schedule.
She said thank you and made small talk while picking up the clothes and then she left again all the while I slowly stroked my cock. The next day I turned on the shower light but kept the other light off. I could hear her open the door and she seemed to linger a bit longer. I made sure to stand sideways, knowing she couldn't see any detail, but I was getting off on her looking at me. I called out to her to ask if she was ok and she said "yes" in a voice that was a little flustered and then she quickly picked up the pile and left.
That weekend, mom came home from shopping and said she had gotten a new shower curtain since the old one had some small tears in the top and asked if I could put it up. I told her no problem, and grabbed it from the bag. As I unfolded it, I noticed that this curtain was transparent. I put it up and wondered how this would affect our little game.