If you’re talking about straight “slop” basically almost porn with great storyline and unique plot, my all time favorites are:
“The girl who married the big snake” and “Ase to Sekken”
Ase to Sekken in particular has another manga called “Sweat and Soap - Baby Making Book” which is basically a porno one shot of them having sexy time. You basically read that after the main “Ase to Sekken” though.
I’m super picky about the straight slop I read, that’s why I don’t have a lot to recommend.

It’s the same story line over and over again. I might just go back to BL it has more substance than straight slop