honestly I've already know about this since the first day Millie sleeping in Zen's house. exactly when they watched that lesbian film. but at that time, Millie's thought mostly filled about her family situations so that's not become the focus of the story. it's Zen who doesn't aware about Millie's feeling toward herself until now. I'm sure Zen assume that Millie see her only as a friend, no more than that. ah, Zen is so dense.........We've been wondering how aware Millie is of the nature of her feelings. Turns out entirely aware! Good for her!