Sofure Buka!
Two coworkers agree to become sleep partners, but then feelings start to develop. (Main story) Chapter 5 - A man's unrequited love for his best friend, who is getting married. Good news about chapter 5 - it has its own manga with a happy ending and new love! Plus the friend has a cameo and is a super great guy. Two men who have been dating a few months finally have sex.
Makkurayami De Kimi To
A man traumatized by past childhood abuse is afraid of the dark and begs a coworker to sleep next to him.
Only You, Only
A gay man falls in love with his company president's son, but when the president learns of their relationship, he undermines it, coaxing his son into an arranged marriage. A realistic, mature love story that ends well and happily, with incredibly touching moments - both happy and sad. I cried quite a bit, but the conclusion has me smiling. This is JUST as lovely and touching on re-read and they buy a car! ETA: I bought the manga since I've re-read it so many times.
Kichiku, Encount
A guy overhears another man's headphones on the train and gets turned on by the porn he's watching. Final chapter: a bartender in love with the hot Russian guy who worked with them for a while chains him up the night before he leaves. Not a healthy relationship exactly but a fun twist. TW for apparent dubcon final chapter.
Michi To No Souguu
Hitorijime no Jouken
A series of one-shots featuring super hot characters, especially the last two.
Bara no Hanabira
I read this less than 24 hours ago and hardly remember it. A guy who has a crush on someone knows they can't be together and hooks up with a coworker who initially pressures him, but then they fall in love? There are a bunch of flower references and the flow was choppy. 2023 reread: I really enjoyed this on reread!
1/2 Cigarette
Himono, Tokodoki, Shanairen'ai
A hot young guy at the office falls for his capable, attractive boss...who is actually sloppy at home and lives with his beloved cat. Once he gets through his boss's cool exterior, things seem like smooth sailing...until the ex boyfriend comes into the picture. The one with baseball ticket stubs.
Ren'ai Shinan!