Hope he is doing well!

As a recent convert to this genre (I lean more horror/sci-fi/fantasy) I'm also exploring such stories.Evil mirror by bmordo is the one that started this path for me. One other author that I like besides Don is Kingbooruwa/kingb especially " A Wife and the Savages" and "Beast and the beauties". I like him the most in stuck-in-an-island subgenre.I love the twisted vision of Tarzan-Jane dynamic and the detailed description of the geography and anthropology that goes with it (though I'm pretty sure none of them are accurate). They do contain some NC themes, so feel free to ignore if they aren't your cup of tea.
I also liked "the Queen and the old man" by SteamyEncounters (an young queen has to go into hiding as a hung old man's wife to escape assassination), mainly because of its medieval settings, unfortunately its incomplete. I'm currently looking for some mythology based cuckold stories( I am toying with an idea about a demigod's wife accidentally sacrificed to the underworld and he has to complete some tasks to rescue her, while "Hell" turns out to be layers of hedonism and sexual depravity and each layer she unlocks a side of her she never knew she had) hopefully I find something!