Responses
Just let her be, she's happy that way
Polygamy is fine when it's healthy and all parties involved are totally okay with it, which happens to be the case with these three. As for the other cases, lgbt people are a thing and it was indeed a common thing for soldiers to engage in homosexual activities for the exact reasons they gave in the manga.
Why the fuck this manga have so many BL. Usually i like BL but damn it i dont want to see it on shoujo manga especially if its related with the ML and why the fuck the FL is okay with that cause its common sense that its cheating (╯°Д °)╯╧╧