sorry kaname fans, i think so too...i think she's too caught up in the idea that he saved her a long time ago and she's so thankful for it, that she's fooled herself into thinking that she loves him...another thing about kaname and yuuki is that kaname has such a mysterious personality that it causes yuuki to want to figure him out and her supposed "LOVE" for him is getting confused with admiration... however, if it really is LOVE, then ...
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I think it's more of a family kind of love because they are related to each other and even though she kissed him in chapter 41 of the manga, she called him brother right after...seriously, i think she just cares for him in the family kind of way and feels that its her responsibility to keep him happy...
Now if you ask me about zero, then i'll immediately tell you that she does love zero a lot and i personally think its LOVE LOVE, not brotherly/sisterly love...because it really doesn't make any sense...i mean, yuuki has totally showed how zero has a huge affect on her and to think that it's a BROTHERLY affect is just really weird...besides, its obvious that they have such a good chemistry together and just because she's protective of him, doesn't mean she only sees him in the family kind of way...in that case, kaname sees yuuki as his sister as well because he is also very protective of her...but i love zero's character and i think that his relationship with yuuki is so different when compared to kaname's...
therefore, i think that yuuki is pressured to love kaname due to his over-obessiveness while with zero, she formed her feelings on her own and that to me definitely shows that she really does love him, a whole lot...