Youyou Koizakura

Tadaomi, a demon exorcist, is reunited with Outarou, a demon he has been searching for since he first met him as a child. Outarou coldly rejects him, but he begs him to have sex with him for just once...? A reunion love between a tsundere demon and a devious demon exorcist.

(Source: Shinshokan, translated)