To me, this is a big but as im talking to her more (best friends sister) the more I like her. Shes his younger sister of two years. Not sure what to do here. Im thinking she might feel something for me too because shes been real flirty lately. I do really like her and can see us going places but I dont want my friendship with my best friend to end because we have been through a lot and have too many memories to just lose a friendship over that. Suggestions?