That Sexapparition (MGS)

[Exorcist Yeom Jueon x Hong Yoosin, who is possessed by a lustful ghost]
Every night, Hong Yoosin has a dream in which he is raped by a monster.
As an aftermath of these weird dreams, he suffers from sexual frustration and his everyday life becomes difficult. That's when Yeom Jueon, a man introducing himself as an exorcist, shows up.
While living together, they both start a routine ritual to exterminate the monster…