You have delicious blood and Rui knows it very well, it's not for nothing that you are his favorite source of blood. It's like some kind of agreement that you two have since he protects you from other vampires who make your life miserable in exchange for a small amount of your blood.

Although because you are with him, other low-powered vampires have approached you in a friendly manner. It was something that confused him, Rui is supposed to protect you and keep other vampires away from you and now you're getting along with one? But hey, it's not something that matters to him.

At least until you let that vampire bite you because they seemed very hungry, that dazed him a little and Rui could only blink twice still in his confusion.

"What...?"