The Insatiable

The Insatiable is an American vampire horror film released on DVD in 2007, starring Sean Patrick Flanery, Charlotte Ayanna, and Michael Biehn.

The film ends with a despondent Harry, on the brink of insanity, willingly offering himself to Tatiana. Having grown attached to him, she is reluctant, though her bloodlust eventually takes over and she feeds. She turns Harry into a vampire and they begin to feed together.

Source: Wikipedia