A frightened teenager was forced to hand over £15,000 of her mother's gold jewellery to prevent a blackmailer exposing a sexual encounter between them.
Defendant Aamir Khan (20) convinced the 16-year-old victim he had covertly filmed them during an intimate act in his car.
He then callously made demands for "money" and "gold", threatening to post the footage on Facebook and send a copy to her parents. The victim was so frightened of her parents finding out about the encounter she took jewellery, including irreplaceable family heirlooms, and handed them to Khan through her bedroom window on several occasions.
Such was her shame, the girl, who is Muslim, considered running away from home and killing herself, Leicester Crown Court was told.
Khan, of Redwood Walk, Spinney Hills, Leicester, admitted blackmail.
Sentencing him to three years and seven months' detention, Judge Michael Pert QC said Khan's actions were "wicked" and a "cynical betrayal".
He said: "The blackmail happened in 2009 when you were 18 and she was 16. It's of some significance you both come from a background where the shame of teenage sex would have more impact than perhaps it might in other circles.
"You made a number of demands over several weeks, cynically and brutally.
"She would have been mortified of photographs going on Facebook and her parents getting to know.
"There has to be a deterrent sentence.
"People must realise what an appalling crime this is and how members of society view it with disgust."
He said Khan only admitted his wrongdoing after a long delay, on the day of the trial.
Judge Pert said: "You hoped to get away with it and didn't plead guilty until the last minute, causing the victim more anguish about whether she'd have to say what had happened in court – and then be called a liar."
Jonathan Eley, prosecuting, said after the sexual encounter with the victim the defendant dropped her off in his car.
Khan casually remarked: "It's a good thing Blackberrys [phones] have cameras."
A few minutes later he phoned the girl, saying he had filmed what had happened.
"He told her to get money or he'd post a copy of the film through her letterbox and put it on Facebook so her family would see what kind of daughter they had," said Mr Eley.
"The family had high-value, high carat jewellery and she took rings, bangles and chains.
"The next night the defendant collected it from her window.
"He later falsely claimed half of it was fake and demanded more gold and made more threats about the video.
"A day or so later he took more bangles, chains and necklaces with family names on them."
He told her he needed the money to recompense someone for damage he caused to a car, and later demanded more gold because he needed to spend money on his own vehicle.
Mr Eley said: "She told him it was all gone.
"He then sent her a message saying he'd given the video to a colleague who knew where she lived and demanded £500."
There was a burglary a few weeks later at the house, by persons unknown.
The victim's sister suspected something was wrong, and found incriminating messages from Khan to her sister, demanding gold.
The girl confessed to her family, who have had rallied round to support her, said Mr Eley.
No video footage was ever recovered and it is believed no sexual encounter was ever recorded. None of the jewellery, worth £15,000, was found.
In a victim personal statement, the girl said she thought about running away and ending her life because of the "whole nightmare for me and my family".
A pre-sentence report on Khan described him as "controlling and manipulative".
Judge Pert made a restraining order banning Khan from any contact with the victim or her family.
Anthony Rimmer, mitigating, said: "It was an unsophisticated blackmail. He's shown genuine remorse and realises the shame and abhorrence it's caused to the girl's family.
"He wishes he could turn the clock back."
