A twisted teenager and her boyfriend who she encouraged to murder his ex to 'prove his love' have both been jailed for 16 years.

Rhett Carty-Shaw and Sarah Mohamed were both slammed as 'narcissistic' as they were caged for their despicable murder plot.

Mohamed, who has recently changed her name to Kyro Mori Akihiro, had learnt that Carty-Shaw had continued to see Ms Nassir, then 16, behind her back.

She was 'incensed' and told him he would 'have to work hard to win back her affections', reports the Manchester Evening News.

Carty-Shaw went to her house and launched a brutal knife attack. Ms Nassir survived the attack but was left with with terrible injuries.

Ms Nassir still has to take painkillers and has difficulty lifting objects

The identities of the defendants, still both 17, can be revealed after a judge lifted reporting restrictions.

Ms Nassir speaking of the pair said: "I felt like she had it in her, but I never felt like he had it in him."

Sentencing, Judge Alan Conrad QC told the defendants: "How the two of you could be intent on the murder of this girl really does defy belief, and can only sensibly be understood by reference to your two warped personalities.

"You are both selfish narcissists who believe that the world revolves around you, and who play out your sick dramas on the stage of social media."

Rhett Carty-Shaw with Imam

Egged on by Mohamed, Carty-Shaw had turned up at Ms Nassir's home in Openshaw armed with a large kitchen knife and a change of clothes.

Spending two hours in the house, he had sex with Ms Nassir before launching a brutal attack, which left her with life changing injuries.

"What sort of person behaves in that way?," Judge Alan Conrad QC told Carty-Shaw.

Ms Nassir, now 17, courageously spoke in court of how the ordeal has affected her, in front of the two defendants.

Carty-Shaw with Imam at a school leavers ball

She said: "I can't do things I want to do anymore because I'm too scared, I'm scared that someone is going to come after me and finish off the job that Rhett and Sarah both started and tried to do to me."

Manchester Crown Court heard how while Carty-Shaw was in the house, Mohamed was outside and sent more than 50 texts encouraging him.

She had been 'incensed' and 'felt humiliated' when she learned Carty-Shaw had continued to see Ms Nassir behind her back.

Mohamed said he would 'have to work hard to win back her affections'.

The day before the attack he searched online for 'asphyxiation', 'how many years is someone in for murder' and 'how long do murderers serve in prison'.

Carty-Shaw told Ms Nassir that he had been 'ordered to kill her'.

Outside the property, Mohamed told Carty-Shaw to get photographic evidence by his current girlfriend, who was waiting outside.

She told him to 'vid it'.

Inside the house, Carty-Shaw was displaying bizarre behaviour.

He asked her if she would kill herself for him - and even suggested she put make up on her neck to make it look like she had been strangled, so they could take a picture and pretend he had killed her.

But determined to 'prove' himself, Carty-Shaw launched a savage attack.

In a garden at the side of her house, he attacked her to the head, neck, armpit and back, with what Ms Nassir described as 'massive kitchen meat knife'.

Ms Nassir spent four days in hospital following the brutal attack

It was sheer good luck that she survived.

A flurry of texts were then sent between Carty-Shaw and Mohamed.

"Done it… you good that I did it", he texted.

"Bare weight lifted," she replied.

Then, more messages from her.

"Love you."

"Did you get rid of the phone?"

"Leave fast."

"Undies (slang for police) on the area."

"Show me vid."

"Leave now."

"We got sh*t to do."

"Why aren’t you replying?"

And then, as she became suspicious he hadn't gone through with it: "Hurry up, what’s taking so long?"

Later, when the pair had left the area, the victim bleeding from ten wounds, the attacker told his lover and accomplice: “I did it to prove I love you… there was no other way to keep you."

"I know there wasn’t…I’m gonna protect you at all costs", she replied.

"Just breathe, calm down, make sure you feel alright," she went on, adding, "on Tuesday I’ll link you and have an entire identity change n get rid of everything alright... I would have done the same for you."

Mohamed waited outside texting encouragement

Instead, the boy was arrested within minutes on suspicion of attempted murder, found standing at a bus stop with two Matalan bags - stuffed with bloodstained clothes and the weapon used in the attempted murder.

Earlier that day, his girlfriend and accomplice had bought Dettol wipes to clean the knife with.

Defending Mohamed, Peter Wright QC said that she was otherwise a 'intelligent, articulate and personable young woman' with 'considerable potential'.

He said: "It is a matter of considerable dismay and sorrow that a young woman with such obvious quality and ability with a potentially bright future before her, from her academic and extra curricular activities relating to her school, now faces the prospect of custody.

"Now she has dashed all hopes of a glittering career or future and she must now seek to make amends by way of rehabilitation."

Katherine Pierpoint said that Carty-Shaw has a 'low level of intellectual functioning', and that he is 'susceptible to manipulation and coercion.

He has 'genuine remorse' for what happened and has been a 'model prisoner', the court heard.

Iman Nasir outside Manchester Crown Court

Carty-Shaw was found guilty of attempted murder and admitted possessing an offensive weapon.

Mohamed was found guilty of intentionally encouraging or assisting him to commit murder.

After the hearing, Detective Inspector Jennifer Tattersall, of GMP’s City of Manchester Division, said: “The defendants devised a devious plan to murder the victim, with the boy seeing fit to arm himself with a knife and inflict life-threatening wounds to the victim.

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"Thankfully, the wounds sustained in this brutal attack weren’t fatal.

"The girl was taken to hospital in a serious condition, and has been deeply affected by the attack. I want to commend the bravery and courage that she has shown in coming forward and assisting the police during the investigation.

"Both defendants deserve the sentences that they have received and they now have time to contemplate their senseless actions behind bars."