Mujikaku Love Factor
Shun, a gay, promiscuous, business man, goes to work with a vibrator in his ass and unable to bear the pleasure any longer, he goes to the bathroom to relieve himself and there he meets with Ichinose, his boss and the person he hates the most. After blurting out that he has a vibrator inside, Ichinose offers his help and they end up having sex at a bathroom stall. After that, Ichinose offers to help Shun with his sexual needs until he finds himself a lover that actually loves him and this would lead to a close relationship between them. I liked it. It's kind of funny how Shun wanted to be manipulative and all just to fail. And Ichinose being all out going about Shun and his feelings... Priceless.
Gurume no Fukurami