A teacher showed a 15-year-old boy an internet porn site before indecently assaulting the youngster, a court heard.
David McPhearson-Smith, 41, allegedly took the boy to his home after promising him a drink of juice, having already groped the lad.
Newcastle Crown Court heard that the prefect, who cannot be named for legal reasons, had been preparing for a concert when the German teacher groped him.
Tim Parkin, prosecuting, said: "The boy initially refused to go back to his house but the defendant persisted."
The court heard that the youngster confided in a friend about the incident in June last year.
Mr MacPhearson Smith told police the boy's claims were "utter rubbish".
Mr McPhearson Smith, of Cleadon, South Tyneside, denies two charges of indecent assault. The trial continues.
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