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.
Are ga Shitai, Kore ga Hoshii.