Veronica Leal and Penny Park are getting ready for a special occasion by trying out new dresses in the changing room. However, Veronica drops some dresses on the floor and bends down to pick them up, at which moment she spots a huge worm crawling on the floor. She gasps, leaving just enough time for the alien parasite to lunge inside her mouth.
It takes control of Veronica, turning her into a mindless, horny vessel for the alien. After spasming on the floor she gets up, scaring Penny who starts running away from her in one of the changing rooms as Veronica tirelessly hunts her down. Penny goes through the vents but there is no escape, it’s a dead end. She soon caught up to by frenzied Veronica, who overpowers her and transfers the worm through her pussy.
While the transformation takes place, Veronica’s tongue goes deep inside Penny’s pussy. Instead of being frightened, after the transformation, Penny shares the same hunger for pleasure with Veronica. They begin to scissor each other, and share the translucent liquid that both of the parasite hosts secrete from their pussies and mouths.