Yuyuko blushed a deep shade of crimson when Kat started to ask about her being shy.  She tried to keep her emotions in check, but it was difficult.  She just hoped Kat didn't notice.  "Well, uh... no, you didn't do anything wrong, it's just... you... I don't know...." she finished in a weak voice.  She didn't dare say anything about being attracted to her, she didn't want to scare her sister away or have her talk to their parents about anything.  "I think I'm going to get something to drink, I'll be right back..." she said, standing up.  She walked over to the bar and ordered a beer - sadly, they didn't have any sake here - and brought it back out to her chair, not daring to say anything else to her sister for the moment.