Youko wants to be closer to Tako; a daddy's girl type of relationship. After the Christmas drinking, Tako carried Youko to bed. She was aware this whole time so she can remember the moment. She told Akira, "it was like he was carrying his own kid... reminded me of my dad (ch 140)". She misses her dad and that's what Tako is to her. Strangely so far, Tako is obvious to this dynamic.