What to expect in this story

This is an au where Streber is a real vampire because no one really writes about it and it's a cool concept. Also the art is by daily-streber on Tumblr.
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Streber is a vampire who stalks the town at night, hunting unfortunate souls who happen to cross his path. However, one night he finds a certain individual, who no matter how hard Streber tries, he can't kill him like the other humans in the past. This upsets Streber, why can't he kill this certain human? And why does Streber get weird feelings around him?