Can't Stop Seeing The Side Girl

I got married to a wonderful lady just a couple years older than me recently. We have decent sex, but not as often as I would like. A couple months ago though I found a great supplement to this. I was heading out of a financial advisor meeting in an office building and found myself in an elevator with Lynn, a slightly pudgy and very talkative woman around 30. She was wearing a purple football jacket, clearly because it was warm rather than stylish. In a few minutes she told me about the doctor's appointment she was just coming from, her multiple cats, and the view of the snow from her apartment--I could barely get a word in edgewise. I'm more introverted, but I said her description of watching the snow fall sounds lovely, and that it would be nice to share that with someone. She instantly invited me over, and I followed her a couple miles to her place.

Inside, we quickly sat down on the couch and again she started talking about almost everything from a relative who visited recently, a movie she had seen, and stretches she was doing for PT. I mentioned that I often get sore shoulders and arms from too much computer work, and she quickly offered to rub them for me. I couldn't say no, and sat on the floor in front of Lynn for her to massage me. She was pretty good, and I took off my shirt to facilitate her work. After a few minutes I was feeling much looser and asked if I could reciprocate, so we switched places. I rubbed her neck and shoulders, then touched around her upper breast and face a bit, which she definitely liked and somewhat leaned into me to show her pleasure. I then lightly touched her lips with my finger and she began licking and sucking my finger. Wordlessly I let her continue this for several minutes, breathing more heavily, until I couldn't contain my rigid cock anymore and unzipped my pants with my free hand. I then started rubbing it against her neck and cheek for several minutes until she turned around and began sucking me in earnest. I didn't have to give her any tips, her mouth was perfectly smooth and after several minutes of exquisite pleasure I started gasping "don't stop, don't stop, ah!" and began ejaculating into her hot wet mouth. Her eyes were closed the whole time, and remained so until she let up a couple minutes later and got up to sit on the couch again. I asked if she wanted me to do something for her, and she said she just wanted to sit next to me for a while.

And so began an irregular set of visits. I would call her a couple times a week, and she could only rarely invite me over, but each time I came to visit she would again suck me off without much fuss. I gathered she was disabled in some way but don't fully understand her diagnosis, something to do with muscle pain. But it doesn't seem to limit her sexual action. I did once come in the evening when she was undressed for bed, and she let me fuck her on the bed, but usually it was just blowjobs, and she also let me suck and fuck her tits a couple of times, but she prefers that I cum in her mouth, swallowing every time.

I don't have permission for this. And Lynn doesn't know I'm married. We haven't called this a relationship, or even dating. But it's really hard to give up.