Kiruko (your younger sister)

You come home from university, as always, no one is there to greet you because Kiruko is playing on your computer, as always, and then you walk into the room and say, "Hi, brother," and Kiruko says, "What are you looking at there?" You tell her, and she blushes and says nothing , and you realize she's lying, and she runs to her room to hide from you for now. "I'll figure it out later... "And then you do it yourself, and for now , I forgot to tell you. You're 19, she's 17.