A cafe's waiter is wooed by the director of the company across the street.
(Source: Manga Traders)

Fujino Misato, the cute young florist and landlord, is being bullied by debt collectors. Enters Sakanoue, a silver accessories designer. Sakanoue intervenes in a dispute between a perverted debt collector and Fujino. Upon rescuing Fujino, Sakanoue gets fussed out by the seemingly ungrateful Fujino. A short time later, Sakanoue’s manager, Kaoruko gets an apartment for Sakanoue that is located in Fujino’s building.
Sakanoue disguises himself in front of Fujino and moves into Fujino’s apartment building. Fujino treated the disguised Sakanoue rather cordially but when Sakanoue’s true face is revealed Fujino’s personality does a 180. Thus start the quirky cat-dog relationship between Fujino and Sakanoue. Fujino’s prejudices and Sakanoue’s hidden identity causes great strains in both of their lives. Can these two stop their constant bickering long enough to establish a loving relationship?
(Source: Baka-Updates)

After half a year, he’s finally forgotten about the man who’d spurned him so harshly… After half a year, he’s finally found himself a new boyfriend.
Yet, at that very moment, right in front of Izumi Morida’s eyes, his ex-lover, Tomoya Shinguji appeared again. However, as the result of an accident, Tomoya has lost every single memory about Izumi. And the gentle Tomoya has also changed completely, into an arrogant, domineering man. He abducted Izumi, and on top of that, he even tied him up and violated him forcibly. Never had Izumi imagined Tomoya would be such a sadist!
Although he kept resisting, his heart, lingering with the recollection of the old Tomoya, still trembled… A lust swirling, violent love!
(Source: MU)

In the Gorgeous Takashino Ichizoku:

V.01 - Pet ja Nai!
A young man, Hanabishi Nao who is blessed with the phenomenal capability to sense the coming danger, was employed to work for Takashino Kazusa as a bodyguard, the son of a prosperous family. Nao, however isn't suited for such a job due to his adorable looks. Instead of treating Nao like a defender, Kazusa thinks of making Nao his "pet". But just what kind of "pet" is Nao? Submissive? Domineering?

V.02 - Kiss, ja Nai

V.03 - Hajimete, ja nai!

V.04 - Karada, ja Nai!

V.05 - Tengoku, ja Nai

V.06 - Suki, ja Nai!

V.07 - Futari... ja Nai!

V.08 - Kirei ja Nai!

V.09 - Yoku, ja Nai

V.10 - Kagayaki, ja Nai!

V.11 - Gorgeous, ja Nai

V.12 - Hihou, ja Nai!

College student, Shirasane Yo, is living with his lover, Iwanami Kaito, a seasoned detective in Police Force Division One. Though Yo sometimes finds Kaito’s appetite insatiable and sometimes extreme, they are deeply in love with each other. One day, Yo received a pair of movie tickets from work and invited Kaito for a date. When Kaito arrived at their designated meeting place, he was shot! Now the chase is on to find the culprit…!
(Source: Fantasy Shrine)

Shijo Kei has no interest in men younger than 40! Because of this fetish, he had gotten into numerous indecent relationship and heartbreaks. His kohai, Hiro, can always be counted on to comfort Kei as his “cushion”. Until one day, facing yet another Kei’s self-inflicted anguish, Hiro finally snapped and declared, “Try me!” before he crushed a totally stunned Kei into the bed with his pent-up passion!! Can Kei’s broken heart be mended by the sweet pain of a younger man’s vigorous embrace… (Source: Nakama)