Otsukare-sama desu

Masumi Shinonome (aka Massuu), a college student, has the ability to exorcise spirits because he inherited his great-grandmother's power. He spends his days exorcising the spirits that possess his friend Eiwa Mikoshiba, who has a constitution that attracts spirits in an unusual way, but one day Mikoshiba's body is taken over! Moreover, because it was a sexually-oriented spirit, he and his friend end up having accidental sex.... Hino Chihaya sends you a slightly horrifying new BL! (Source: Takeshobo, translated)