My Heart Can't Beat Unless You Tell It To

A woman, Jessie, and her brother, Dwight, care for their chronically ill younger sibling, Thomas, who is unable to venture outdoors during the day and must regularly drink blood to survive. Dwight and Jessie provide blood for Thomas by routinely murdering strangers, mainly homeless people and drifters. Jessie works as a waitress in a local diner, while Dwight spends his days pawning items he finds around town and visiting a prostitute who he pays extra for a few minutes conversation after their liaisons.