My Son Makes Me Feel Like A Woman

I'll go straight to it: my son and I are in a sexual relationship. We have been for two years and we haven't stopped.
For context: my relationship with him was always unusual. His father got me pregnant very young, so my son was born when I was only 20. His father (a much older guy, 35) and I married shortly before that, but our marriage crashed and burned a couple of years later. He was in a much better position to provide for our son, so it was decided that he would have custody. My son was raised by his father for the most part, I was mostly around for the ocassional visits and some holidays. At one point growing up, he told me I was kind of like a fun "older friend". It led me to think he didn't really see me as a mother. In time, I made my peace with that.
Since my chances at an education were basically screwed, I turned to living from my body. I was always pretty, liked exercising and had a good figure, so I made my way as a fitness coach, with a few modeling jobs sometimes in my younger days. Discretely, I also accepted some work as an escort. Naturally, I also dated a lot, so I gained a lot of experience and became very liberated and open minded, sexually speaking. I didn't remarry, though. Even if I say so myself, however, I'm still very beautiful, even more so than some girls half my age. A few wrinkles here and there and some surgical help with my boobs, but otherwise I still turn heads from men of all ages.
That would, eventually, include my own son.
More context: my exhusband, his father, died during my son's final year of college. Fortunately, he left enough for his remaining tuition and all his possessions, so he didn't need to turn to me for support. Not that I wouldn't have tried to help him, but the prospect of such a responsibility always got me anxious. While we weren't close by then, we stayed in touch in the same amicable way we always did. He did turn to me, however, when the panemic hit. We both had to rely on each other, actually. Being kind of new to his position, he was let go and asked to move in with me, since he didn't have enough money to last long. Since I worked mostly on gyms and those were shut down too, I thought it would be mutually beneficial. I had a spare room, so it worked out.
Except our relationship didn't evolve into a mother-son one, because it never was. It felt like having a much younger but fully grown roommate. Before long, we started to become more comfortable and casual around each other. I started using my usual sportswear around the house and I could notice him looking at me. "Boys will be boys", I used to say to myself, and I didn't think much of it.
Things changed when we started running low on cash. I didn't want to turn to being an escort again, because of its perils and because it was even more dangerous during a pandemic. But I found out about OnlyFans and I thougth why not? In secret I started to take nude photos and uploading them there for some quick cash. I was so successful that I even kept going aftet the pandemic.
Thing was, around that time, he found some small, remote freelance jobs, and he worked hard to earn his money. Sometimes he was going at it late at night. One of those times, noticing his ligh was still on pretty late, I went to his room planning to turn it off and go back to bed.
Except he wasn't at his desk. He was lying in bed, fast asleep, his cellphone still on in his hand. Except that, when I approached to take his cellphone from his hand and charge it, I saw what he was lookig at: it was my pictures on OnlyFans. Then I looked back at him: his cock was half-tucked in his pants and there was a box of tissues beside him.
At first I was shocked, but I noticed myself feeling excited, even aroused. I had enjoyed teasing him with my tight clothing up to that point, and I began to realized there was a mutual attraction. I enjoyed his gaze upon my body, and I started to notice his: all his life I had tried to teach him how to be healthy, and he had kept it up. He wasn't extremely muscular, but he had muscles under his pijamas, clearly. And then I surprised myself getting more and more brief glimpses of his cock.
I still can't explain what came over me, maybe I was just too horny or losing my mined from months of confinement, but then and there I lay beside him and started stroking his cock. Before long he woke up and tried to back away in shock, but I held him and shushed him gently. I remember saying: "I know what you've been doing... and I like it", I whispered to his ear before kissing him deeply. He stopped resisting and, shortly after that, we were groping each other and moaning like mad people. Once fully naked, I pinned him down and fucked him dry while he moaned "Oh mom" all the way.
In secret, we have been sexual partners since. We still live together, like a couple. It's a strange feeling to be sure, knowing our true relationship, but I'm addicted to him. We date openly for appearanes, but no one fucks me like he does.