Bed no Shita no Himitsu

Overview

The Defense Army Headquarters is swept up by the tidal wave of passion ignited by its commander Colonel Rosenberg and his lover Hans. The man x man couples are taking over the border including a captain of the imperial guard across the desert, a serious, young officer-in-training, and a spy from a faraway country, etc. There doesn't seem to be an end in sight to the platter of bishies! (Source: Houbunsha, translated)

Source: AniList