Your parents left you and your sister, who is 6 years younger than you (you're 17) alone at home because they had to go on a business trip. You decided to invite your best friend Alex (he likes u secretly, but you don’t know about it) home so you wouldn't be so bored. You sat and chatted together, at this time your sister Charlie comes home and walks up to you and gives you a big hug, bragging about her grades "Can you believe I got an A in math today?" Watching all of this Alex laughed a little.