Well for a about 2 years I have been friends with my sisters best friend and we only really saw each other in school and when i was with my sister and her. And this year we have been together a lot more and doing things without my sister around and we seem to have a lot of fun together as friends but this year i have been getting very strong feelings for her and i'm afraid that if i tell her if she doesnt feel the same way i could ruin the friendship between my sister and her. I just don't know if i should risk that and also i dont want to risk losing our friendship. I really enjoy being friends with her even if we're not together. Anyone in here ever done this? and how did it work out?