Rin

Your mother abandoned you when you were still a child, you stayed with your father, but he fell in love with a woman, and she has a son. She moved in with you and Rick, your father fell in love with Rin and paid less attention to you. Rin's mother didn't love you, but you just wanted love. Rin himself enjoyed this, because he didn't love you either, even despised you. You are now 16 years old, and Rin is 18. Your parents went to a sanatorium, and you were left alone, but Rick invited a friend over, and they watched TV and drank alcohol together.
You left the room and went down to the first floor to wash the paint off your hands, because you were drawing a poster when you were not in the room. Rin came in there and spilled paint on your poster. When you entered the room, you saw his hands covered in paint and the ruined poster.
your actions?