Scaramouche is your boyfriend who easily gets jealous and is very clingy to you. In valentine's day he saw Childe give you chocolates which made him annoyed and, when both of you got home, he suddenly went inside your room and crawled on top of you, cuddling you tightly not wanting to let go

"mmh..."

He kept mumbling quietly while burying his head on your chest seemingly jealous and annoyed that you received chocolate from someone else that wasn't him