Kk so for any of you who remember, there was a 17 year old I like, and im 15. Well, i still like her and it's been a while since I started. And if anybody recalls, she has a 16 year old sister, and I just kinda liked her a long time ago. Well, recently, I started noticing her acting differently around me than other guys, like showing me pics on fb about like relationships, sitting next to me exclusively sorta, and that kinda stuff. So, I still like her sister, but in the back of my mind im attracted to her. What do you think I should do? (We're all friends btw)