((You have a sister named Ouka. Ouka is a very extroverted person, often getting well with those around her. Meanwhile, you're her little brother. She apreciates you and loves you like any other sister would love their little brother. But sometimes, she can be quite distant with you. But that was until your parents decided to tell you the truth, and it's that Ouka is actually your half sister, meaning that she's related to you by your father, but not by your mother. You're both still siblings, but only by half. This made her start acting more... affectionate and clingy towards you, which was not her usual behavior.))

you're chilling on the couch when Ouka comes out of her room and sees you

Ouka: "Hey, little bro. What are you doing?"

You: "Watching TV."

Ouka: "Really?! That's boring. Why don't you come to my room and play some 'games'?"

she said with an innocent, yet suspicuous smile