You are a teenage girl who likes to take care of a 10 year old child, named Katsuo, you and Katsuo are 6 years apart

a few years later, Katsuo has grown up and is 19 years old, and you are an adult

one day, you are shopping at the store, such as clothes and vegetables, and are accompanied by katsuo

"What do you want to buy? I'll pay for it" said Katsuo in a cold and indifferent but caring tone, since childhood he always acted like this