Great post,
sums up some of my experience as well.
I commend you for the courage to write something that honest.
Single mothers have a tendency to throw caution to the wind and do that type of thing with minimal hesitation and even less remorse.
Nicely done.
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I had a similar thing happen a couple of times but one that was very similar, I was in my early 20s and was not exactly 'dating' a single mother but we were 'friends'. She in her late 20s and had 3 children; The eldest was a girl in her mid teens and 2 younger boys were I believe 10 and 12 ish? something like that. The boys were outside playing soccer and the girl was out somewhere. We were taking in her room and she was telling me that the boys really love having me around, apparently even though I hate children and can't stand them, somehow I was the best 'father figure' they've ever had. She said they kept asking her things like if we were going to get married which she said no to, making them upset. I thought that was cute and took it as my cue to make my move. Pretty soon we were naked and fooling around a bit but not fucking, she was worried the boys would suddenly come back and they frequently walked into her room without warning,. Our "solution" was to have sex on the bed under the sheets so we'd be covered if they walked in. As to why we didn't lock the door, she said that they never locked that door because her kids should always be free in their own home or something like that. Note that there were only two rooms, she and her boys stayed in one while the daughter stayed in the other. I'm not sure why it was setup this way but I didn't care to ask.
Anyway ,when we were done fucking, we were spooning naked on her bed, hidden under the sheets doing the pillow talk thing when suddenly her two boys burst into the room and I freaked out internally thinking that it was over. To my shock she talked to them completely normal saying that we got cold and asking them if they behaved, things like that. This went on for a bit and the older boy left but the younger boy stayed. He had some bullshit he was upset about which ended in her telling him to come in for a hug, lifting the blankets and exposing her naked body to her youngest with me behind her, by this point I was rock hard again and had been inside her for awhile but he couldn't see from his perspective. I didn't move during their hug but she shifted her weight and moved a little, basically telling me to go for it but I didn't, even I have limits. Anyway, they hugged for a bit and then he left. At the time I wondered if he didn't understand what we were doing but anyway we fucked again and I was much more energetic and aggressive than before. Good times.
Months later I talked to the boys in private over some problem they had and straight up told them I loved their mother and sometimes we did 'things'..... to which they almost laughed in my face saying "Yeah we know, we're not stupid." and more importantly they were happy that that was the case because they wanted me to stay with their mother, they didn't want me to leave. It was totally the opposite of what I expected and I grew fond of those kids. The mother was an absolute degenerate but the sons, instead of becoming freaks like me, went in the exact opposite direction despite probably watching their mother get fucked by strange men on a regular basis. To be honest, I felt pretty bad for them and wished I could help raise them but that didn't happen. Apparently the guys their mother hooked up with were such pieces of shit that to them, even someone like me was amazing in comparison, that's truly fucked up. I don't want kids but I grew very fond of her sons, teaching them what they should do, how they should do it and why. In turn they viewed me as "the only father they've ever had". Unfortunately their mother and I were only ever 'friends' and while we were sort of together for a shockingly great couple of months, as soon as she was hooking up with another guy I simply backed off entirely.
Other single mothers I've been with weren't much different. This is why I believe OP's story has truth to it.
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Not that it's sexy or anyone cares, but I saw her many times after that and her boys picked up a lot of my quirks, phrases and hobbies even though I explicitly told them "Don't be like me. I suck.". when they were a bit older I asked why and they said I was really cool, "really smart", fun to be around, never hit them and never abused their mother so they admired me greatly which was SUPER fucked up because that's a really low bar that they picked, me I mean. Still they said they were happiest when their mother and I were 'together' and I found that heart-warming...... as to the mother, she went from guy to guy until she got real ugly around her mid 30s . I still talk to her but now it is me telling her we are strictly 'friends'. Sad, I would have kept her as a wife and taken care of it. I would have put up with a lot of her bullshit simply due to the bond I had with her sons which would have only gotten stronger. God that's such a pathetic and embarrassing thing to say. SHE WAS HOT BTW YEAH, she was a bit shorter than me at about 5'4, stayed in shape, had breast enhancements done at some point but they didn't look or feel fake at all. She was light brown not sure exact ethnicity but looked like a half phillipino half-hispanic mix if you know what I mean....... fuck I should delete this post later, I've never felt like a cuck until now, talking about how I was willing to raise two kids that weren't mine, what the fuck was I even thinking...... I should really delete this