sometimes friends who have known each other for a very long time subconsciously mimic their friends quirks and habits and expressions over time. we can assume that sebastian and klavier have known each other since high school. anway, unrelated, but i can’t stop thinking about sebastian air guitaring when he gets excited, or klavier going like
>:3
They have inside jokes too. Like one day they’re having a staff meeting and everyone hears a very faint “nyaaa~” and Klavier fucking loses it.