Aburk0011

Hey guys! I'm looking for the name of an anime I watched a while ago. Its about a boy who was raised by an adoptive mother figure who drinks heavily but is skilled in military tactics and gunfare. She let's her subordinate take his virginity when he was like 12 or 13 I believe?? This was NOT a hentai and didn't show anything but he gets sent off to this school i believe is all girls on a special mission of some kind. Does any of this ring a bell??