BL. Domination. Note that this is a parody and the characters themselves poke fun at the rape stuff like they're breaking the fourth wall. Nonetheless, it's a fun read where the both of them are trying to cater to each other's kinks.
Warning for rape (though I mentioned that already).
One Shot. Pain play. This is by no means a good representation of a proper S&M relationship. That, I believe, is part of the manga's criticism on how it ("I'm an M"/"I'm an S") is easily thrown about in conversations. However, what it is instead is a thought-provoking piece for looking into the psychology of sadomasochism.
Warning for gore.
Roleplay. Couple tries out various forced sex scenarios. They have pretty good chemistry and banter so it's a bit of a fun read. Focuses on the smut more.
Extra: http://www.mangago.me/read-manga/henai_maotoko_hen/
Sadomasochism. Doona is one of the most well-rounded woman I've read under the josei genre. May as well be the epitome of an HBIC (head bitch in charge). Doona is bi, so a good amount of sexual diversity can be found in this title. How she treats her sexual partners both in and out of plays directly reflect how she feels about them.
Note: I'm no longer reccing the later parts since it's just 2 sadists on a power trip.
Buy: https://www.tappytoon.com/series/sadisticbeauty/1
BL. Humiliation. Sex toys. Focuses on the smut more. A country-boy salaryman and a coffee shop worker have the time of their lives having scorching-hot sex while falling in love and going into domesticity.
BL. Bondage. Focuses on the smut more. Mainly Shibari (rope bondage) play. Rui, one of the lead, is a Shibari artist.
BL. The plot itself ties in well to the D/s power dynamics.
Buy: https://www.lezhin.com/en/comic/bloodbank
BL.
Sakurada-senpai Kaizou Keikaku