A borderline psychopath who indecently assaulted a 15-year-old girl he held captive was jailed for 32 months yesterday after the judge said he doubted his ability to be rehabilitated. Lai Chun-ying, 24, pleaded guilty to common assault, indecent assault, unlawful sexual intercourse with a girl under the age of 16 and unlawful detention - charges which arose from an incident at Lai's home on May 2 last year. One count of rape was left on file after the prosecution accepted a guilty plea on the four other counts. In sentencing, Mr Justice Thomas Gall said Lai knew the victim, as she was the former girlfriend of a friend. The victim said she had gone to Lai's home to retrieve some pictures. The judge told Lai: 'You were in a position of dominance over her and although she went willingly into your room, she did so to try and obtain photos that you had of her with her former boyfriend.' He said Lai had then told his victim that in exchange for the photos, he was entitled to hit her - which he did by punching her in the chest. 'As common assaults go, it is relatively serious,' he said. Mr Justice Gall said Lai had indecently touched the girl, before removing her clothes and having sex with her. The girl was then allowed to get dressed, but Lai refused to hand over her ID card. After 'further acts took place' Lai bound her hands and feet and taped her mouth, the judge said, adding that the victim was able to escape after several hours and raise the alarm. Mr Justice Gall also commented on a psychological report prepared for yesterday's sentencing. In it, Lai was diagnosed as having some psychological problems - one of which was a borderline psychopathic personality - although it said he was not suffering from any mental illness. Quoting from the report, Mr Justice Gall said Lai had been assessed to be suicidal, callous, remorseless and lacking empathy over the incident. He also had repeating fantasies which suggested sexual deviance. 'All this suggests that his re-offence risk is high. Supervision after release is essential to minimise recidivism,' Mr Justice Gall said, reading from the report. He told Lai it was not likely he would be rehabilitated after serving a stint in prison. 'You are not of good character, having a number of previous similar offences on your record,' he said. 'You are not young and you have not the benefit of youth. The only mitigation is a plea of guilty.' He sentenced Lai to two months on the common assault charge, 18 months for indecent assault, 20 months for unlawful sexual intercourse with a girl under 16 and one year for unlawful detention. Mr Justice Gall ordered the unlawful detention sentence to run consecutively to the other sentences, which were to be served concurrently - making a total of 32 months.