From Hoshikuzuu Scans:
Closet idol fan, Mikado, hates his superior, Anezaki. Anezaki is very capable in his work, but he hands all the grunt work to Mikado. One day, Mikado is charged with sending a drunk Anezaki home after a company drinking party. But they missed the last train and end up spending the night at a love hotel. There, Anezaki suddenly mounts Mikado and continues to do the dirtiest things.