My Relationship With Mom

My mother was a young, single mom. She provided for me mostly by herself, which meant she spent long hours working two jobs (as a secretary and as a gym instructor at nights), while I stayed at my grandma's. As I grew up, my relationship to her was more alike friends: we went out on weekends to have fun, and then I almost didn't see her again during the week. Our relationship changed as I got older: as a teen I was allowed to go out with friends on my own, so I was less of a burden to my grandma, and my mom became a little more free. It was at that point that she started to date other men. She's always been a very attractive woman, and I say this without judgement, but apparently her bedroom had a revolving door of boyfriends, older and younger. She's always been very open about sex and taught me to be the same, we talked about it openly, but at the same time, she was careful not to be too explicit about her particular love life.
However, thing changed one day, when I was about 17, I was home from school earlier and she was off work. I walked in on her being made love by two men. It was an uncomfortable, shocking moment, but we managed to leave it behind for the most part. For me, it changed the way I saw her. In a sense, it was like being friends with a woman, but when you kiss her or date her, it becomes sexual. I didn't see her as "mom" or as an older friend anymore. She was a very sexual woman, and I was obsessed with the thought... to the point that I found myself attracted to her, catching myself looking at her ass or breasts. It didn't help that she's always dressed very sexily and even teased me about it. I started jerking off thinking of her, or even thinking of her when I was with other girls.
The breaking point came in my 20th birthday. We had friends at our place to celebrate, and I was drunk by night –not blackout drunk, but enough to just be generally uninhibited and almost unable to stand. When everyone left, she helped me to bed, and that's when I blurted out that she was so sexy and I loved her. She brushed it off as drunken blabbering, but when she leaned in to kissed me, I went for the lips. She didn't stop me, but after a while she tried to pull away and I asked her to stay. We made out, went with the flow, and made love that night. I fell asleep after cumming inside her, but was surprised to find her still sleeping beside me, naked, the next morning.
We had a serious talk then: surprisingly, she said she was fine with it. She explained that, to her, love is love, and that love isn't necessarily a part of sex, because sex can just be about two mutually attracted people giving pleasure to each other. She confessed being attracted to the man I'd become, but being too scared to do anything about it. However, she questioned if we could be an emotionally involved couple, beyond keeping things only physical. We decided to figure out the answer as we went, and agreed that we could keep having sex as long as it was protected.
And so, my mom and I became secret lovers, but after a year of dating, we decided to become a couple. I rent a small place and we ocassionally date outside of our relationship to keep appearances, but for the most part, we live together and sleep on the same bed. She says I'm an exceptional lover that has restored some of her self-confidence by embracing her as she is. She has very large breasts, and she says some lovers were put off by them when age and gravity started to do their thing on them. For my part, I think that saginess that comes with age is so sexy, and she, as a mature woman, is a much better lover than the young woman I date every now and then will ever be.
And I've had such amazing experiences with her. She's very open minded and sexual, she loves anal sex and even double penetration (mostly with toys, but we've been to swing bars posing as a normal couple and taken other partners as well), but she absolutely loses it when I cum inside her pussy (she likes to whisper "breed your slut mother" in my ear as I'm about to climax, and that just does it). Our sex life is explosive, and I know the taboo of our relationship is too serious to ever come out with it. But I wouldn't have it any other way.