Kore wa Akuma de Yume nanode

Overview

An inexperienced middle-aged incubus's intensive sex training! Despite being an incubus, Forni is not good at sexual matters, so he passes out in the street because of starvation and gets rescued by host Harumi, who takes him home. That night, Forni sneaks into Harumi's dream to have a meal (his semen), but it's his first time and he doesn't know how to do it, so Harumi ends up teaching him instead...! "When it feels good, say it, okay?" So, to help Forni get used to "sexy things," they start living together—a life full of sweet excitement and first-time feelings...! (Source: ShuCream, edited)

Source: AniList