Yeah, there are uncomfortable power dynamics at play for those roles

I most certainly was not trying to insinuate that. I was wondering if there was a constructed situation where it may be acceptable and I realized that the most obvious issue to me (age gap) is not necessarily an issue and noted that at the end of the paragraph.

I did not realize how it would be misinterpreted but in hindsight I get it.

It would be weird and fucked up, possibly abusive.

But if it's abusive, it's already illegal and no sexual act should be illegal just because I consider it weird.

Might even be unconstitutional to make sex between (adult) step-parents and their children illegal but I'm not sure.

Depending on the age range? Its perfectly fine. Hell one of my newish neighbors is one such couple. Dudes dad was dating a women 9 years his junior. They divorced after two years if i recall and his son got together with her and got married.

They been together now like 20 years. He was 22ishand she was like 41ish if I recall right when they got married. He's now in his 40s and she's in her 60s.

They are fantastic neighbors. But to be fair was a weird story the first time I heard it from em.

And to be fair they arnt even the largest age gap couple I know. One of my mother's friends is married to a dude that's like 80 and she's 50 they been together for 15 years.