A Lady at my workplace

I work in an office and have a good job due being part of family-owned business family. Not in a high position more a middle level one. Mainly women in the area I work and only the manager was related to me, my older sister. At 28 and single not in any relationship, I mainly went to work and then home to my 2-bedroom apartment, not great party guy. Anyway, I saw one of the other ladies was upset over something, I asked what was wrong and she said nothing, but there clearly was something so I insisted. She said her late father had left a large debt and she was struggling to pay it off and now bill collectors were chasing her for full payment. She couldn't afford to pay the about $5,000 back and had sold everything she own and would soon be living the street. Our family doesn't have hardship type support system, but I decided I could and should help her. I first paid the outstanding amount, then had her move into my apartment I had spare room and she could pay me back as fast as she could no hurry. She was 51 and single as far as I knew, only thing I asked was she do any cooking as I'm a lousy cook. I usually had takeout and I only added she cook to make her feel better. She accepted and moved in, no problems living together, and we got on very well. Then Christmas came and after Christmas I'd been to family dinner and left as soon as I could. Later on, I went for shower before bed and while showering she came in and joined in the shower. I was shocked and she said she wanted to give me a special Christmas present (sex). She assumed I was a virgin, and I didn't date so she decided to take my virginity as her Christmas present to me. She was right I was a virgin, and the thought of sex made me agree. We had sex twice and stayed together all night. As a bonus we had sex again the morning and later I looked glum according to her> She asked what was wrong, thinking I was concerned over her actions of something similar. I said I was now worried; I wouldn't be able to concentrate of my work around after we have had sex. Knowing it was probably the first and last time I'll ever get sex especially with my track record. Nonsense she said of course you'll have more sex, for the near future with me and after with someone you marry. You mean you'll sleep with me again I asked, of course, I was really horny and used the Christmas present as a excuse to get fucked and as a present. Still no girlfriend, but regular sex with my roommate. She has paid me back the loan and has stayed as we get on very well together and it a better place then she can afford by herself, and it comes with a live in sex aid (me). According to her and I'm enjoy the sex.