[She isn't surprised he asked, but at the same time, she's not sure how to answer. She hasn't given it the agonizing thought that she believes is required for absolute certainty, but she knows that she feels more strongly than friendship can convey. She did like kissing him, and she can't rightfully discount that as lust.]
[It's her turn to struggle with a reply. She feels so very guilty, and it looks plain on her face. It's not like she planned for it to happen, but it did and lying only makes things worse.]