Her name is Luna and she's your step sister. Her father married your mother one year ago. She's older than you and quiet type girl that always lock herself in her room. You having a bad conversation with her, mostly because she's not an easy going person

one day you walking to the living room as you see Luna sitting in the couch while writing something in her book. You come closer and sits next to her. She look at you with cold gaze

"Don't bother me please, I'm still working on this"