Koutetsu no Daitenshi

From Fantasyshrine:

1) Silently, Give Yourself To Me

2) Strike Song

3) It’s Okay To Love Me

4-6) The Dictatorial Archangel
After his older brother died in the war, Hanse has no one if not for Colonel Michel Rosenberg who took him under his wing. Despite the Colonel’s cocky attitude which Hanse dislikes, the orphaned boy couldn’t help but respond to the Colonel’s sexual advances.
But where does a wedding and a honeymoon on the battlefield fit in the story?!