Datsuryoku-kei Maou-sama no Yuuga na Hibi

The current demon king holds immense demonic powers but finds everything to be extremely bothersome. He's fed up with Rudy, his personal attendant who is always scolding him. Rudy asks him to act more "king-like." Instead, he enjoys his lazy days, calling all things bothersome.

One day, because of his lack of ambition and desire, he was questioned if he even felt lust. As expected of the king who finds everything bothersome, he appointed Rudy as his nightly partner in order to silence him. To his surprise, Rudy agrees and suddenly pushes down the demon king...?!

(Source: Kaiohsha, translated)

Included one-shot: Kitto Suki ni Naru