Porn pioneer John Stagliano’s groundbreaking “Voracious” series delivered undead lust, vampire intrigue and kinky, hard-core sex. In the new second season’s dark narrative, the fetish porn world’s top talents clash as perverse cravings create an eternal battlefield, with many casualties. The three episodes presented on “Voracious Season Two Volume 1” are tales from the nighttime world of a modern San Francisco ruled by a clan of supernatural sex fiends.