A sex assault victim made a recording of herself begging to be set free after she was lured and imprisoned in her attacker's home.
Brian Taylor, 46, pushed the teenage victim upstairs and locked the doors at the house before subjecting her to a prolonged and terrifying assault.
Despite her fear, the teen, who cannot be named, managed to press record on her mobile phone and captured an audio recording of herself asking to be let go.
Taylor, of Hylton Castle Road, Castletown, Sunderland, denied false imprisonment and three sex assaults but was found guilty by a jury after a trial.
At Newcastle Crown Court Judge Robert Adams sentenced him to four-and-a-half years behind bars with a Sexual Offences Prevention Order and sex offender registration for life.
The judge told him: "This was a sustained assault, a prolonged assault. She was particularly vulnerable because she was someone who was being imprisoned by you in your home at a time when you were committing sexual offences towards her.
"Eventually, she managed to get away. She went downstairs.
"She appears to have managed to record part of the conversation between you and her on a device.
"The part of the conversation which appears to have been recorded was her asking you to let her go."
Prosecutor Daniel Cordey told the court the attack happened when Taylor and his victim had been at the same party.
They left the celebration to buy more alcohol and Taylor lured her to his nearby house, where he lived at the time, claiming he needed to pick up his car keys.
Once he had his victim inside the house, he refused to let her back out.
Mr Cordey said: "It was late at night, she was lured into the defendant's home and pushed upstairs, for a time locked in."
In a victim statement the teen said she was "terrified" during the attack and feels "physically sick" when she thinks about what happened.
Mr Cordey added: "She said she was too scared to show emotion in case he hurt her more than he did.
"Every day she thinks about the incident, she can picture it clearly and it makes her feel physically sick."
Peter Shofield, defending, said Taylor was quickly reported and identified but continues to deny the offences.
Mr Shofield said Taylor, who has a partner who stands by him, has no history of similar offending and is unlikely to in future.