Thinking about how Yin was spying on Hei in season 1, observing him to the point where she figured out all his ticks and could tell when he was in one of those moods. Then in the manga we get more of Yin watching Hei literally sleeping, sharing a bed, and letting her use his shirts to sleep. Hei being protective of her and incorporating Yin into his fighting style. It's almost like a dance as they become closer. Then in the ova with the posing as newlyweds, wearing his clothes yet they wouldn't share a bed. Then they get separated and Hei becomes an absolute wreck. It's only when he sees her again is when he comes back to his self. It's a full on obsession
What I am trying to say is Hei would definitely match Yin's freek!
















