What is a crush?

I still remembered the day I found found out about the other meaning of 'crush'.

It was in the sports class that Riley Verma - My classmate - came to me to ask for a favor. She was smirking and her eyes screamed mischief.

We were never too close and didn't talk to each other much, so my 10 year old self naturally I became wary.

"What is it?"

"i just hoped you could do something for me. You sit beside Michael, right? So I just want you to put this letter in his bag."

She handed me the letter. It was more of a scroll than a proper letter but whatever. I didn't wanted to get into drama. What if this piece of paper was important and later she'd accuse him of stealing?

Blame me for reading too many novels but Michael was my friend and I didn't want him in any trouble.

So I asked her, " What is this letter about?And why don't you put it in his bag for yourself ?"

She blushed crimson.

"Well I can't do it because I don't want to get caught. Then he'll know it was me who wrote it."

I was confused . What stuff did she wrote in the letter that she wanted to give it to him but didn't want him to know who gave it . And why did she wanted me to do something that embarassed her. If I got caught, would I be embrassed to?

She must have seen the confused look on my face because she started explaining.

"It's a love letter. Michael...he's my crush."

"What now? Come again?"

"My crush."

"What's a crush?", I asked dumbfounded.

She and her friend looked at me like I was a alien or something.