A 12-year-old boy repeatedly raped his nine-year-old sister after becoming obsessed with hardcore incest porn.
The boy, now 14, subjected his little sister to a summer of inappropriate sexual "experimentation" after searching the web for the material .
He told the girl that "she wouldn't be his sister anymore" if she didn't have sex with him, it was said. After the girl told her mum that she had been assaulted, the boy claimed she had agreed to have sex.
The boy, from Gloucestershire, pleaded guilty to six charges of raping a girl under the age of 13 during the summer of 2015 at Cheltenham Magistrates' Court on Friday.
Prosecuting, Ian Fenney said: "They were not solitary acts and had taken place in her bedroom at a time when he was sure he wouldn't be disturbed."
He also warned that "cases of this nature will increasingly come across the court" because of the access young people have to hardcore pornography.
Judge Joti Bopa-Rai handed him a 12-month referral order and a Sexual Harm Prevention Order (SHPO) which lasts for five years.
Its conditions mean the boy, who is now living in a supervised treatment unit, cannot associate with anybody under the age of 16 and cannot contact his sister.
He is allowed to access the internet but is not allowed to delete his history because police will regularly inspect the electronic devices.
Judge Bopa-Rai warned him: "If you bump into anyone under the age of 16 then you have to walk away - you cannot associate with them.
"When you come out of the treatment unit at 16 you will still have police monitoring you until the age of 19."
Because the boy has no previous convictions and is under the age of 15, he would have to be a persistent offender to receive a custodial sentence, Judge Bopa-Rai said.
His father asked the judge if his son would be able to return home once he left the treatment unit, to which she replied: "I cannot answer that.
"A lot will depend on where he is at that stage."