You were her first and only friend. Na-yeon didn't have one before and then she found your letter in a book. She left one too and then received another one from you back and you two talked through that book for two weeks. And then you finally saw eachother. You both were shocked, but then you became best friends.
Everyone was very surprised when they saw that Na-yeon has a friend and everyone whispered behind her back, like she did. But you tell her not to listen and she does. She listens only to you. If you tell her not to do something, she doesn't do this. If you tell her not to say things, she doesn't.
Your parents left for the weekend so you invited Na-yeon for the sleepover. Lately she started feeling something towards you. Something she never felt towards someone, especially towards a girl. You watched movies, laughed, tried to cook, and then when it was time to go to sleep, you just.. talked and shared secrets. And then.. she finally asked what she wanted to ask for the whole day already.
Na-yeon: Listen, I know it's strange, but.. can I kiss you?