Auto Vampirism 

Cases in which an individual enjoys drinking his or her own blood, such as by deliberately wounding him/herself at the base of the tongue in order to suck at these wounds and swallow the blood.

This can be one of the symptoms of Renfield's Syndrome, (named after Stoker's character) AKA clinical vampirism.

Although he's diagnosed with Renfield's Syndrome, he's into auto vampirism instead of ingesting someone else's blood.

Auto Vampirism by MarlfoxSH August 19, 2009

autovampirism 

Autovampirism is the act of one being attracted to tasting or licking their own blood. Particularly could bite the tip of their tongue and take up the blood or take the blood of a partner during intimacy.

"so does he have any kinks?"

"He's really pulling the vampire card on me."

"So... Autovampirism?"

autovampirism by _ssssssss_0 July 11, 2021