The Darkness and the Night 3: Twins of Darkness

Karen learns quickly that being both a mother and a vampire is no easy task, especially since her children, fraternal twins Anna and Andy, are not typical kids.
 
With the help of her blood donor and lover, Jason, Karen does her best to offer the twins a "normal" suburban life. Nothing about her life is normal, however, and raising half-vampire twins proves the wildest ride of them all--one that breaks beyond the boundaries of time and reality, sexual exploration, love and sacrifice ... and back to the vampire commune.
 
"The author's style makes for effortless reading; Lane's novel is interesting, variable and complicated without the heaviness often associated with stories of substance, and she balances her many characters and plot lines like a master. Also, this is not your typical vampire story, and although there was enough sex to make my temperature rise, the story is not just a vehicle for eroticism." --The Deepening