Embrace the Darkness (1999)

Galan (Kevin Spirtas) and Miranda (Angelia High) are a couple with an unusual secret: they're vampires living in modern-day Los Angeles who are looking for new victims to join them in the legions of the undead. But when Galan falls for beautiful Jennifer (Madison Clark), a mortal woman, Miranda feels threatened by her new rival. Miranda seduces Jennifer, but Jennifer is more strongly attracted to Galan, who has promised to give her eternal life.