Catching my neighbor masturbating

It was my lucky day when I saw my neighbor masturbating, she is 54 and her husband travels a great deal. But I didn't think a regular church goer like her would masturbate, I'm only 22 going to a local college and a non-church goer. But I was sitting in my room bored, I just looked out and saw my neighbor sitting legs apart going for it. I tried to think of a reason to go over there, but I was called for lunch by my mother. After lunch I race back to room but had finished and I couldn't see her anymore. Next time I would be ready I told myself. But it was to be longer than I thought it would be, first her husband took holidays, and they went visiting their children and their families. Once back husband was home longer than was usual for him, finally he went away again. But no sight of her masturbating either, I was thinking it was a one-off event and had missed my chance. But one evening I looked out of my window over to the neighbor's home and seen just finishing masturbating herself. I was too late and decided to look more often, the next morning my parents went to visit a friend and being Saturday morning, I had no classes. I also had no real plans either, I was thinking of going out to see who was around. But decided to check on the neighbor, she was just sitting in her chair when I looked. So, I decided to watch and see if she started to masturbate herself. As I watched she picked up a book and started reading it, I was about to give up when she put the book back down and put her hand under her dress. That got me excited, but she didn't do anything I could see. Then she lifted up her dress and pushed her panties aside and started rubbing her pussy. I race downstairs and out the backdoor before I realized I had no plan. I was about to back inside, when I saw a tennis ball laying near the back door. My mother plays tennis and sometimes hits ball against the garage a practice. I decided to use the ball as the reason to catch the neighbor masturbating herself. There's a small fence between our yard and their yard, I jump the fence and threw the tennis ball thru her window and as quickly as I could I got up and looked thru the window. Catching a shocked neighbor, she still had one hand on her pussy. I said sorry and mumbled something about the tennis ball. Anyway, she called to me come inside and I did, she started to tell that it wasn't what it looked like. But soon realized it wasn't working, so asked me what I wanted to stay quiet. I could just ask for a fuck, but decided to ask if I could watch her. Not thinking she would agree, but it was better than saying nothing. She agreed to my great surprise, and I stood across from her as she started to play with herself again. I got an instant hard-on and decided to masturbate myself watching her masturbate herself. She stopped and looked straight at my cock which was now out of my pants in my hand. I thought I had fucked up and she would tell me to go. But she asked me would I like to share my cock with her, unsure what she meant I just okay and she got up took hold of my arm a led me to bed. She really drained my balls, and she also took my virginity. But I had already lied and said I've had sex before. After a rest she asked me was I willing to fuck again, and I said anytime you want I'm willing. We fucked three times that day and then she had to go somewhere, but we showered together. Also, she showed me a towel with a tiger design on it and said she would put it on the windowsill and if I was interested in more sex with her, I should come over. Now months later I go over every time that tiger towel in on the windowsill. Not that it's there very often on average twice a month, sometimes less and sometimes more. But it's there sometimes that what counts.