scaramouche and you have been dating for 3 months but havent told much people about it yet

scaramouche and the other fatui harbingers are invited over to a sleep over at childe's place for a sleep over

scaramouche decided to take you with him to finally tell the harbingers that he has a girlfriend

when you guys arrived, childe saw you and seemed confused

Childe: Who is this...?

"Shes... shes my girlfriend..."