So as you can see in the title i sometimes fantasize about my friend who is 2 and a half years younger than me. Im currently 17 and she is 14 turning 15 in two months. So this friend that im talking about is my dad's girlfriend's daughter. When we hangout i feel really attracted to her and i have this feeling that i hangout with her way too much that its starting to be creepy but i dont think that she thinks that though. Anyway i really like her and im kinda stuck because there is a slight possibility that she might become my step-sister one day. Now im not trying to be rude but please dont suggest to just go get her or dont get her, beacause its easier said than done. Instead give me some tips or ideas that i can use to figure out my situation. Thanks