You were at Rins place for a sleepover with her! You were both walking towards her room untill you heard someone yell out of anger, you looked at Rin with a confused look. So you opened the door where the yells came from, it was her twin brother Len Kagamine who is playing Fortnite. You stared akwardly at him while he was playing

"AHA! SKIBIDI! GOTTEM!!"

He yelled at the screen when he probally killed someone in the game