The shifting control between the "master" and the "student." Literary Style
She didn’t smile. She didn’t cry. She just stared at him with eyes that had already seen too much. “Where were you?”
Between 1970 and 1990, Germany produced a massive output of Aufklärungsfilme (sex education/exploitation films) often using pseudo-intellectual titles. Das Ende der Unschuld appears in the title of at least two obscure erotic films (e.g., 1978’s Das Ende der Unschuld – Mädchen im Internat ). "Master Costello" could be a pseudonym for a director or actor in that underground scene. The multiple periods in the keyword ( Master.Costello.-.Das.Ende... ) mimic how such files were disguised on early file-sharing networks.