Authors note

What if Sora and Shiro actually had two other siblings?

What if those siblings were Lumine and Aether?

What if the porpose for their journey was to find Sora and Shiro?

What if they lied about having being only one other sibling?

What if Lumine and Aether was in contact the whole time?

What if all these what if's are true?

Shorter version:
Lumine and Aether come back home after one of their journeys, only to find their siblings, Sora and Shiro, gone, and their room in a mess. Lumine and Aether are devastated and are determined to find their missing siblings. How would Paimon and the rest of Teyvat react when they find out that they've been lied to?

Extra info:
Male MC
No ships - might change as the story goes on