Switzerland x (Female)Reader: Arrangements

(AU)
(Name)'s family wants her to be married off almost as soon as she graduates high school. Her family is strict and also partially rich. They've given her until her graduation to be engaged to a person of her choice. If she has no one, they'll make her marry a man of their own choosing. There's only two weeks until graduation, and she has someone she wants to talk to, but...she's afraid. The two are good friends, but he can be a bit intimidating. Most of the school tends to steer clear of him, not because he's a bully, but because they don't want to get on his bad side.

'He' is Vash. Vash Zwingli. He's known for his temper, especially when it comes to his sister. (Name) knows this from experience, having been yelled at by him a few times when something came up between her and Lili, usually a disagreement or an event where Lili ended up getting hurt. So when she decides to ask him to be her 'fake fiancé', she's scared to death. However, what happens when he agrees after hearing why she asked? How will her family react? But most importantly, how will this fake engagement change the two friends' relationship?

(Moved from old account)