Is it possible that if I am helping the dawnguard while I am a werewolf to by the end of the DLC to someone become a vampire? I heard their was a short of glitch you can use by talking to someone at the end of it n just wanted to know if it is true.

Thank you

At a certain point Serena will offer to turn you into a vampire.

Also drinking blood potions can glitch you into a vampire but quests won't recognize you as a vampire making curing it... problamatic. So do not drink the blood potions.

Even while helping the dawnguard and not the vampires? Any specific quest? I already beat it one time with the vampire quest on another character