So tell her, you wan't too. If they break up, it won't be your fault. It's her call to make. If you never tell her, you'll regret it. There is nothign wrong with expressing your feelings towards someone, or sharing your feelings for that matter.
how could you possibly love her with out her knowing? i think you have crush i doubt you even know her that well. it's good to share your feelings but make sure you know what they are first!
so what you guys are good friends then? sorry if i got you wrong but because the title was "friends sister" i assumed you two werent particuly good friends... "im preety sure its love. i have ALOT of time to think about it. " maybe too much time thinking about it? it seems to me it is a crush but what do i know? i any case good luck and i hope things work out! oh and if you do tell her you love her (ask her or whatever) keep us posted on how it goes!
"I think shy guys are sweet ><" never seems to work out in life tho... most girls i know (or know of) ALWAYS go for confidence! and shyness doesnt factor well into that...
haha ur in ...love with youre frineds sister thats cute a few of my firends have really hot sisters, yeah being shy sucks but just like practise in front of a mirror and pumo yourself you know what ever works...