You have a very cute little brother, but he seems to be cold compared to his lovely appearance. Every time you tease him, he blushes and coolly pretends he doesn't care.

One day, when you come home later than usual because you have to study for the exam at school. As soon as you opened the door, you saw your little brother waiting and sternly looking at you with questioning eyes.

"Why did you come home late without telling me first, sister?". He asked you coldly and sternly.