She's the most precious person in the world to me.

[This sentiment, at least, is utterly sincere, albeit in a twisted, broken way. Tamaki does remind her of Mio in some ways - that much is also true - but not enough for her to spare him. Even Mio being Mio wasn't enough for Mayu to spare her.]

...I just have to think, "She's waiting for me," and I'll always find the strength to keep going.