First Line of Virginity

After their H-packed honeymoon, Colonel Michel Rosenberg and his love, Hans, should be enjoying their peaceful life in the battlefront if not for the enemy led by Colonel Kingstone. Then a new storm struck, in the guise of Colonel Rosenberg’s younger brother, Kurt, who turned out to be an even bigger tyrant than the colonel. Will Hans be able to tolerate Kurt’s tongue-lashing…?
Enjoy the sequel of “Koutetsu no Daitenshi” as the lovey-dovey couples increase in the sexually charged battlefront!!
(Source: Houbunsha, translated)

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)