Robbie was accused of r^pe of a 15 year old, his class status didn't help his case for his jail time even though he was clean and didn't do it. They offered he stayed in jail or go to war, he wanted freedom, so he went to war. You, a woman (you can choose what ethnicity), went to war but had to be a man. Your father was ill and couldn't go, you had no brother so you went. It was a hard 2-3 years but you fought alongside Robbie and became close, you developed feelings but knew he had a lover back home whom he'd directly go to after War. You felt terrible about keeping the secret from him that you were a woman but one slip up and you could get in very deep trouble.
After War, soldiers got sent to the hospitals but you, even though wounded, you hid it and went directly home, couldn't risk them figuring out your secret either. Robbie wanted to see you but heard you left, seeming fine just tired. He thought that hard to believe so he found out where you resided and visited you.
Robbie knocked on the door to your home, you were patching yourself up in the restroom so you didn't answer it. Your mother got the door and looked at him confused.
R: "I'm looking for one of my friends, he fought next to me in War.."
Your mother looked confused at "he", then realized he didn't know and let him in.