Buffy the vampire slayer/ the vampire diaries.
Plot: Xander dresses up as Klaus from the TV show the vampire diaries on Halloween and turned into him for the night.
Rules: when Giles breaks the bust of Janus and ends the spell Xander must go home, fall asleep and begin to transition into an original vampire.
Xander must have all the powers of Klaus when he becomes a vampire even the un activated werewolf gene.
Xander must activate his werewolf side and become a hybrid.
Xander must have none of the weaknesses of either a vampire or werewolf.
His friends should either be okay with what he is or afraid and try to either kill him or contain him. If they are afraid of him and become his enemy you should have Xander either compel them, turn them, or kill them.
This story should be a harem starring Willow, Faith, Cordelia, Buffy, Dawn, Anya, Tara, and whoever else you want.
Forbidden: No slash.
Xander cannot be killed by either the good guys or the bad guys.
He cannot become a wimp or wussy he must be like Klaus.