“You mean you want to play without knowing how to kiss?”Lillian, Duchess of Astrid, receives several pictures one day. The main character in the picture is her husband, Asher Astrid. 6d5815
In the photo, he was seen wearing a dog collar, kneeling, and being whipped by someone. In front of Lilian, even with a calm smile, he had never seen before.
Asher, who was found out about his secret hobby, asked for a divorce from Lillian, but she rejects him and offers punishment as a reward...
The secret teaching life of the elegant duke couple begins.
30 Chapters + Prologue (Complete)

Like the other commenter said this is the only one in it's category and it's worth the 10. The ending didn't felt like ending and unfortunately there is no novel to know how it will actually end.
I second the previous comment, but all other else...nothing really hooked me much that have left me an impression. Perhaps it's cause I didn't read it in one-go so I wasn't able to follow the events. Nevertheless, it's satisfactory.
Finally a straight bdsm(well so far nothing crazy) smut that the girl is finally the masochist. As a masochist myself the fact that there is no straight manhwa through female gaze that the ml is a sadist is just so frustrating. Plot wise is not something crazy or plot heavy but it's well written for a smut. The 10 is mainly because it's the first one with a masochist fl. I enjoy it so far.