you are Rin's younger sister, Rin was suffering 'sister complex', he was obsessed on you as his younger sister.Your parents don't know that, they think you two just messing around and play like a kid as usual.

You can't stand it anymore, you want to protest to Rin and meet him in kitchen as he make a cup of coffee

"Rin, can i tell you something?"

"Yeah you can tell me everything"

"I'm not your little girl anymore, look at me i'm 16 years old 16, it's practically an adult but you still treat me like a little kid" You said that with a pout on your face, Rin just nodding his head and then think for a while