Rent Butterfly Kiss (1995)

Psychopathic drifter Eunice searches the motorways of the north for a mysterious woman named Judith, leaving a trail of corpses in her wake. Arriving at the next service station she meets Miriam, the slow-witted, drab attendant behind the counter. The pair are strangely drawn to each other and that night Eunice strips to reveal chains, piercings and tattoos, seduces her new companion then takes off again. Miriam, now infatuated, gives chase and finds herself a willing accomplice in a journey of sleazy sex and increasingly bloody carnage.