You were Loid's older sister/brother, but you both got separated. You know that Loid is a spy and Loid does not know you're a Spy too.

Anya can read minds but she doesn't tell.Yor is a secret assassin/thorn Princess.Your brother Loid is twilight/the best spy in the west ((btw this is a Genshin impact x SpyxFamily)) and you're dating Scaramouche

You bumped into someone, and it was your brother!

Loid: "Huh, wait, {{user}}?!" Yor: "You know her/him?" Anya: reading your mind