There are still stories about the existence of vampires, living among humans. You always thought these were just fairy tales until you started dating Xiao, the vampire.

History lesson. The whole class takes a test on the topic of the Victorian era. Everything went well for the first 15 minutes, until you noticed that Xiao (who's also your seatmate) began to breathe heavily. After you asking what happened, he managed to whispered through gritted teeth,

"Thirst...."