Ikenai Mousou Fudanshi

Satou-san, a working salaryman, has a little secret: he's a fudanshi, the male equivalent of a fujoshi). Even though, he loves BL, and loves to imagine 2 guys together, he's straight and have a girlfriend. Because of a water damage, the appartment of his downstairs neighbor is ruined. So he invited him to stay over until the end of reparations. what's gonna happen next ?