Amusing that Yuu only shows those strong reactions of arousal when Mari turns the tables and takes an active role (no matter how minimal). As long as Yuu remains completely in charge, she's always cool as the North Pole. I seem to recall old debates about this paradoxical dissonance of behavior ― and what could be inferred from it about Yuu's true sexuality.
That she secretly wants Mari to reverse dominance on her! By Kekko Kamen's teachings, all dominatrices secretly want to be dominated. xP
Unfortunately, I can imagine a field full of rabbits singing in Taiwanese that all have Donald Trump heads, so Chie sure as hell better be wrong about that being possible.