Eventually he'll learn that Saya would never cast him aside for this. She did that in the past, and never again. She won't blame him for his feelings about the change either, no matter how they hurt. She still struggles to accept herself, how could she judge him for it?

What they both have in common now, other than being vampires, is an urge to hunt and destroy those how threaten this city. Saya makes sure that Katsuki is following as she dashes through the streets in a blur of flaring eyes and silence. She stops outside an alley where a group of vampires has someone cornered, probably smelling the fear on this poor native.

Saya leaps at the first one, circling it in an impossibly fast flurry of movement, her katana flashing as she strikes. The things head falls from its shoulders and she's on to the next.