Yeah, I can somehow see why this chapter caused this reaction. Then again, it was clear enough that the mc imagined the flustered face. Sadly people already forgot that the mc already made the girl blush on chapter two.
On the other hand, I don't really like the vampire, the whole "It's just eating" thing would work if he wasn't only after girls blood. So I don't think the author will be able to make me feel empathy towards him unless something really unexpected happens.
Lastly, it would be really funny if next chapter or later the mc tries to apologize to the vampire guy by letting him drink his blood, only for the the wolf girl to have the same reaction and pull him away from him.