The old Widow

I (26) live on the edge of our town, in my grandparents' cottage, both deceased. I only have one neighbor, a widow (59). She doesn't socialize much and keeps to herself, mostly gardening. Somewhat like me, I work shifts and finds it hard to keep a girlfriend. I helped her once by shifting rocks for a rock garden. One night, I had just gotten home from my job and had a meal on my way home. I was going to shower and go to bed. I stripped naked, showered, and dried myself. Went to my bedroom still naked and didn't turn on any lights, intending to go straight to bed. I could see my neighbor's bedroom light on, and she was laying naked on her bed, masturbating herself. I got an instant hard-on, so I started stroking myself, watching her. The following day, I could only think of her sexually. I wanted to make a move on her, but didn't know how to proceed. After several days, I decided to return the favor, as they say. I would lie on my bed and masturbate so she could see me. The upcoming weekend, I had off, and I knew she would be out Saturday night for the church cake sale. She always entered her cooking and got home about 9.30. I planned to be naked, lying on my bed. With my head out of her line of sight, that way I could plausibly miss seeing her turn on her bedroom light. I sat naked in the dark, watching for her return. I saw her car return and her head towards her front door. I went to my bed and thought of her masturbating to get my cock aroused. Using a shaving mirror positioned to see her bedroom light come on. She entered her bedroom and saw me straight away. She quickly undressed herself and lay on her bed. She turned off her light, but I assumed she was masturbating herself also while watching me. I got myself off and turned off my light. The next day, she was in her garden and moving large empty plant pots. I offered to help her, and she accepted. Unsure how to bring up what had happened last night, I decided to let it go for now. Anyway, she asked me to hold a ladder steady while she got some things down from a high shelf. A bunch of cane stakes for training plants. She was high enough for me to look up her dress; I could see her panties. I got aroused by the sight and got a bulge in my pants. She looked down as she started down and saw me looking up her dress. Didn't say anything about it. On getting off the ladder, she saw the bulge in my pants. She asked if I liked what I saw; I just nodded. Well, she said Show me your cock so I can see what I've done to you. I did as told; she touched and said, " Well, I might as well drain it for you. I nodded again, and we went to her bedroom, where she masturbated me. I was at first disappointed; I had hoped to fuck her. But after getting off, she said we should shower together and then give my cock a true test. I looked at her, and she added I want to ride your cock. I nodded again; we spent the rest of the day fucking. We have regular sex now, a signaling system where she lets me know when she wants fucking. No need for me to signal her, as I always want sex. I come home from the late shift; if her bedroom light is on, I go to her place for sex. On average, we fuck at least once a week, sometimes more.