Hatarake! Inma-kun: Konya mo Ecchi na Gohoushi shimasu

Super elite office worker Kamiya only wants one thing—to get hard. His constant worry causes him to make frequent mistakes at work, and even affects his daily life. All until one day, when incubus Yan shows up in his room!! Could he do something about it...!? But here comes the answer, "I mainly get my supply through wet dreams. I don't wanna work!" Without thinking, Kamiya provokes him. "For starters, show me you can make me hard!!" They begin having sex, and he looks down there to see it get full of energy...!?

(Source: Renta!)