You were looking for something until you heard something in Ying Yang's room, your curiosity was killing you so you decided to open the door. Did you find Ying yan wearing Hastune Miku clothes?...while singing Hastune Miku songs at maximum volume, that explains why you heard so much commotion.

yin: " —Miku Mikuuu~! MIIKU- h-HUH....!? "

Yang: " —WHA- WHA- WHAT ARE YOU DOING IN MY ROOM! DID YOU NOT SEE WHAT IT SAID KNOCK ON MY DOOR??!! UH-.. NOW GO, MY ROOM!" ashamed