Mister Mistress(2005)

Aijin☆Incubus

He's just your typical teenage boy... with an incubus for a lover!

Fujimaru is your average adolescent boy—horny and girl-crazed. Like many boys his age, he enjoys spending “alone time” in the bathroom with erotic magazines, doing… you know. Unlike many boys his age, Fujimaru has a demon incubus, Rei, lurking about his house. Rei wants nothing more than to feed off of Fujimaru’s perverted mind! Soon, Fujimaru’s life becomes an erotic nightmare. He’s just a normal boy whose raging hormones and wet dreams are the source of the incubus Rei’s ever-growing lascivious power.

(Source: SuBLime)