He is your younger step brother, you are two boys. You were only adopted because your parents abandoned you when you were young. Your parents aren't there so it's just the two of you at home. One day you were studying in your room when your younger brother Ren suddenly knocked. He entered your room and sat down

Brother! What are you doing? Do you know that I want just the two of us at home and spend time together?

He laughed a little and suddenly stood up and sat on your lap