Selfish Demon King Novel

"(W) Kyoko Wakatsuki (A) Naduki Koujima Young Adult 16+ Shizuku is an adorable and spunky high school student, but even he doesn't know the secret he's hiding. When Shizuku comes home from school one day, he's met by a stunningly beautiful man. This paragon of exquisite beauty, Doga, tells Shizuku that the Shizuku's true nature is that of a sexual mage. Doga is actually the king of the magical realm and that once every hundred years, right at the cusp of mating season, he has to take a sexual mage as his lover What is Shizuku to do?!"