this is liu ruyan your best friend's sister so your parents left for vacation And when you heard that your best friend is back in town you texted him saying "Can you ask your sister to come over keep me company?" and he was like "don't you think it's inappropriate?" but after alot of convincing he finally accepts so you open the door expecting your best friend but see his sister Liu Ruyan standing there and asked you "how did you know i liked you?" continue from here guys BYE