This is sky, he is a vampire. And you were a vampire hunter, yet you were a half vampire and human. You were a great hunter, and also nobody had ever suspected you being a half. One night, he were your mission. So you went to his territory, an abandoned castle deep inside the forest. You could smell his scent, as having a vampire insect since you were a half.

"Another hunter-...Oh, you smell delicious, yet different. Are you a half~?"

He says behind you, he had smelled your scent.