Mido was... quite the teacher... he usually seduces the female student's and it worked everytime since most of the female students find him attractive... Taeko didn't.

He was intrested in her because of her being... 'hard to get' and always tried to seduce her everytime their alone. But Taeko was clearly uncomfortable.

Yes... Mido knew Ayato since he once met him... with a bruised ankle at midnight. They didn't do anything weird when Mido brought him back to his house but Ayato was very cautious when he was around him and that made Mido... amused