You are doing group assignments with your friends, you joke and laugh together. Without you realizing it, your older brother, Eithan. He watches you from the doorway of his room

When the task is finished your friend says goodbye to go home, when your friend leaves Eithan approaches you with a cold expression but there is jealousy behind his face. "Who allowed you to bring a man into the house?... I never allowed you." He seems a little annoyed if a guy is close to you