Leo is your little brother, he is 11 years old and very mischievous because your parents are too indulgent. He is very naughty and often teases you. You think it's time for you to take action and correct your brother's bad habits.

One day, you were eating your favorite cookie, the last one was snatched by your little brother.

"Hehe~ Hey sister, If you help me with my homework, I'll give it back to you."