A young woman, Emily, discovers an unusual rock during a nature walk that harbors a sinister entity. The Master, a parasitic being, enters Emily's mind during her intimate moments with pantyhose and transforms her into a dominatrix figure in her dreams. Emily is obsessed with her stepsister's feet in pantyhose and has lesbian thoughts and fantasies about her stepsister and stepmother, which she feels guilty about. Through the Master's influence, Emily's desires and control over her family become more pronounced, blurring the lines between reality and fantasy.