AN art teacher who was caught indecently assaulting a teenage pupil in a classroom was jailed for three years yesterday. The man, 37, had formed a relationship with the girl, 15, and she fully consented, the High Court heard. They were discovered when other teachers burst into the room and found the teacher and pupil committing a sex act. Prosecutor Linda Millar said: 'They saw the defendant standing in front of them with his trousers unbuttoned, unzipped and lowered to mid-thigh while the girl sat in a chair behind a desk.' The teacher threw himself at the door and hurriedly tried to slam it shut. By the time the other members of staff regained entry to the room he and the pupil were fully clothed. The teacher pleaded guilty to indecent assault. His plea of not guilty to rape was accepted by the Crown. He was employed by a school in a Vietnamese detention centre. The man sent a message through a member of staff on July 6 last year saying he wanted to see the girl in the art room. Other teachers became suspicious, which led to the two being caught. When questioned by police, the teacher, a married man with a two-year-old child, admitted the offence. Defence counsel Charlotte Draycott said there was doubt about the girl's age and the man had thought she was over 16. Judge Saied said the offence involved a grave breach of trust.