A woman threatened to cut off a schoolboy's penis and pull out his facial piercings using pliers, a court heard.
Aleah Johnson and a teenager who cannot be named, then demanded that the 15-year-old confess to a serious sexual offence in a call to police.
However, there was no evidence that such a crime was committed, Preston Crown Court heard.
Stephen Parker, prosecuting, stated that the 38-year-old and her accomplice lured the victim to Bispham Rock Gardens, Blackpool, by contacting him through a mutual friend's Snapchat account.
Upon his arrival, the schoolboy was instructed to fight the teen.
When he objected, Johnson smashed a bottle of vodka over his head, soaking him in alcohol.
The pair then set upon him with the teenager putting his foot on the boy's head as Johnson kicked him to the face.
Johnson clipped the pliers to the crotch area of the boy's jeans and told him if he did not confess she would "come back and cut it off."
She threatened to "skin his dog, slit his mum's throat, set fire to his house and pull his facial piercings out with pliers".
As the terrified youngster was on the phone to the police, Johnson grabbed his fingernail with the tool and mouthed the forced confession to him, Mr Parker told the court.
In a victim impact statement the youngster said he was was "extremely anxious" following the attack.
He suffered bruising to his face and was treated in hospital.
Police recovered CCTV from a nearby property during the course of the investigation, but on September 5, Johnson approached the householder and called him a "grass", saying he did not know who he was dealing with.
She waited outside the man's house and when his wife came out, told her that her husband had cheated on her.
She pleaded guilty to assault occasioning actual bodily harm (ABH), possession of an offensive weapon ad witness intimidation and appeared at Preston Crown Court to be sentenced.
The court heard Johnson, of Rossendale Avenue North, Thornton-Cleveleys, has worked all her adult life, most recently as a carer, and has recently undertaken qualifications in childcare.
However it is unlikely she will be able to work in that field in light of her convictions.
Judge Altham said: "She has shown herself to be perfectly capable of issuing serious threats of violence."
He sentenced Johnson to 18 months for ABH, with seven months to run concurrently for possession of an offensive weapon. He added a further eight months for witness intimidation.
The teenager pleaded guilty to ABH and will be sentenced at Blackpool Magistrates' Court on December 9.
