Possessive Lovers (Yaoi)

Some time ago, the son of a long line of earls, Houjou, was forcibly pushed down by his arrogant classmate, Himuro. Six years later, the two meet again and Himuro uses his power to make Houjou accompany him on a cruise as an employee, in place of his little sister. On a luxury cruise bound for London, the Taisho era romance of the man with great integrity and the man who just thinks he’s great.

Prequel: https://www.mangago.me/read-manga/nemurenai-koibito/
Takashi and Chizuka are back. Ex-lovers come to mess with their relationship.

Spin-off of: https://www.mangago.me/read-manga/dekiru_otoko_no_sodatekata/
The shrewd restaurant owner, Hatakeyama, is in love with Yamasaki, the beautiful chef from a rival restaurant. In the past, Hatakeyama tried to embrace him and Yamasaki hates him for it. Despite this, Hatakeyama refuses to give up and aims to start again as friends. Although Hatakeyama often asks him out to eat, Yamasaki still doesn't show any interest in him. Soon, a rival makes an appearance.

Meiji, a novelist, and Haru, a pastry chef, have been dating for 8 years. Meiji is still very possessive and worries about Haru. Everyone around is concerned that Haru's too kind & soft-hearted to let Meiji tie him down that much without thinking of his own happiness & future.

Ch (1-2) Wachi and Kumakiri. Wachi wants to settle down with a wife and kids. Kumakiri wants to be his wife and he's mostly joking. A year has passed and the "joke" is still on but now they even started having sex, as much as it displeased Wachi.
Ch (3-4): Oka broke up with the super clingy Kokushou and the poor guy can't work properly.

Prequel: https://www.mangago.me/read-manga/nemurenai-koibito/
Continuing the relationship of Chizuka, a rich and capable noble and Takashi, an ordinary Japanese salesman. Soon, a new and mysterious co-worker shows up who seems to be there for revenge.

Ever since high schooler Oto was little, he has idolized his older childhood friend, Naruyoshi. Even though he always wants to be with the gentle Naru-chan that teaches him anything, due to a certain incident, Oto ends up feeling distance between the two of them. Without knowing what to do, Oto confesses his feelings.

Ch (1-3) Hayama would always sit on the sofa, waiting for his roommate (and lover)'s return. The truth is, Hayama had been abandoned without knowing about it. When Namikawa moved in, they both had a wonderful life together without Hayama's roommate. Namikawa felt sorry for him, and started to develop a feeling of love and jealousy toward the pure and timid Hayama.
Ch (4) From the perspective of Hayama's ex-lover, Maki.
Ch (5) Childhood friends who fall in love.

(1-4) One day, the unlucky Taira dives face-first between the legs of the judo club captain, Kusehara. Kusehara then insists that Taira 'take responsibility' and starts to enact various perverted things to him every day.
(5-6) Ibuki and Kazoumi are childhood friends and they live together since Kazoumi's parents left the country and because Kazoumi's father and Ibuki's father are friends. Since then Kazoumi takes care of Ibuki, who is the spoiled-unaware type.

Youji has been absent for around year due to health problems. Upon returning to high school, changes started to occur to him. For instance, Tetsuo, a guy who Youji rarely speaks to starts approaching him constantly, and when asked why, never gave an answer. At the same moment, Zenya, appears right in front of his eyes, saying it's all his fault. Making matters worse, Youji starts having strange pains and nightmares.