The manga's i reccomended are with good plot and doesnt rely on sex scenes for example sultan's love
After the fl saved the prince from the assasins his brothers sent he fell in love with her he became sultan to save fl from being a concubine however the plot for virgin with is well shes a virgin who gets a handsome guy as a slave (?) And yada yada its just sex
Honestly I get you, but its ac hard tryna find straight manga w/ good plots.
Aside from the ones you've mentioned, there aren't any others that really come to mind.
But the virgin witch is one of those rare smut manga that has a tolerable fl and actual consent when it comes to the snusnu which for me, made it more of an enjoyable read so I recommended it ^^
Not to mention the beautiful art, but yh the plot isn't anything to gas over.
Yes, the plot of Virgin Witch is not as serious as the ones You recommended, but it's not just smut. Tbh from my perspective, the stories from this author, like Missing O and Virgin Witch have a lot of sex scenes, are erotic but also very much full of emotions and sentimental moments. Maybe it's because the author is a woman, I just got this feeling from reading the sex scenes, they didn't make me aroused, which would be common from smutty comics, but they felt rather heartwarming or just made me invested in the emotional progress of the couples. So yeah, it does have a lot of sex, the mc from Virgin Witch goes through a very much sensual adventure but the emotions have just as important part in the story. I hope I'm not the only one whos sees this work for more than just a manhwa with sex and nothing else.

Oh my god yeeees another smut manhwa with good plot
If u guys waant other stuff like this try
Blood Of Madame Gissel
And Sultans Love