Are ga Shitai, Kore ga Hoshii.
1-2, 6. Sasanuma's boss, Kuji, will sleep with anyone, and has fallen in love with Sasanuma's bigger-than-average cock. They begin to see each other in a new light, soon enough. 3. Kuji's coworker Yonekubo is in love with Nakaba, Kuji's brother. They have sex, but Yonekubo wont text back afterwards, afraid of messing things up. 4. Haruka's housekeeper is buff and kind, and quits after they have sex when Haruka comes home roofied. They figure it out 5. Ayumu is about to kill himself, when he decides he wants to have sex with his crush before he dies...so he assaults him. It doesn't actually work, but they become unlikely friends, and maybe something more.
Fukigen na Kimi to Kimagure na Kiss
[Spinoff/Sequel of Asatte ni Kiss] Haru is always taking care of his popular friend Kunihiko. When Kunihiko steals Haru's first kiss out of jealousy, they are forced to confront their feelings for one another (with a little help from Akihisa and Yuu).
Kanchigai Tokidoki koi
1-4, 6. [TW: Rape attempt by other character]. Taira has an abnormally strong sense of smell, and falls in love with an unknown boy on the train who helps him. With only the scent to go by, he switches schools to find his crush -- a tsundere boy named Misato who's being stalked. 5. A dark and twisted story about a boy who gets plastic surgery to look like his older brother, bc hes "in love" with him. Fucked up, glad it didn't end with them together.
Suki ni Nattara Dame desu ka?
Shiraishi teases Natori, his teacher, saying he must like guys. To quell Natori's anxiety over being found out, Shiraishi comes out to him as well. They begin developing a strong relationship, and start officially dating when Shiraishi graduates [nsfw only after Shiraishi has graduated]
Asatte ni Kiss