A girl of 15 performed oral sex on a 33-year-old married teacher in his car, a court heard yesterday. They were interrupted by a patrolling police car. The girl told officers that the teacher, Yeung Tin-shun, was her boyfriend. Yeung, formerly a primary school teacher at Tsuen Wan Public Ho Chuen Yiu Memorial College, pleaded not guilty in District Court to one count of indecent conduct towards an under-age child. He also taught fencing at a secondary school and the girl was one of his students. The court heard she told police they started a relationship in April last year and she was not troubled by the incident. In a recorded video interview conducted at a police station two days after the incident, she told a police social worker that she met Yeung on May 26 after leaving school at about 5pm. He drove her to Yau Ma Tei for dinner and they headed to Shing Mun Reservoir at about 7.30pm. After he parked the car and kissed her, she said, Yeung asked whether she loved him and she replied she did. He then asked how much she loved him. The girl said she did not reply because he had to answer a call from a teacher on his mobile phone. She touched him while he was talking, and performed oral sex at his request after he finished the telephone call. The pair stopped when Yeung heard a car approaching, she said. They then realised it was a police car. In the interview, the girl said what they had done did not bother her. When asked whether she thought what he had done was right, she said: 'He had already asked me whether I was willing to kiss him.' She said she believed they had a girlfriend-boyfriend relationship. The girl also recalled in the interview she began contacting Yeung in October 2006 when she registered for his fencing course. She said their first date was in late March 2008, when he drove her to Tai Mo Shan. She also said she did not know if he was married because he seldom talked about his background. The hearing before Deputy Judge Johnny Chan Jong-herng continues today, when the defence is expected to start cross-examining the girl.