A former school teacher from Maidenhead who groomed a 15-year-old girl for sexual abuse has had his 18 month sentence doubled.
Luke Fisher, 28, preyed upon the teenager after contacting her through social media.
At Aylesbury Crown Court in May the Pinkneys Drive resident was jailed after admitting he met a child following sexual grooming.
He also admitted to three counts of sexual activity with a child.
On Wednesday, after a reference to the Court of Appeal, three top judges in London increased Fisher's sentence to three years.
The court heard how the 'popular and able' history teacher had been warned previously about his conduct towards young girls.
He did not heed the warnings and contacted the girl online.
They chatted and met twice at his home after he picked her up and drove her there.
On a sofa and on a bed they kissed and he put his hand into her underwear, before stopping when she became uncomfortable.
Afterwards, he almost completely blanked her, leaving the girl feeling upset because she had believed they were having a caring relationship.
In a victim impact statement, she said the incidents had caused her to lose social confidence and become anxious.
On behalf of the Attorney General's Office, lawyers argued yesterday before Lord Justice Treacy, Mrs Justice Lang and Judge John Bevan QC that the term was much too soft.
Judges were told that despite previous warnings he had planned the offences targeted against the girl he knew to be vulnerable.
Giving judgement, Lord Justice Treacy said: "In our assessment, this case would have merited a term of around four years after a trial.
"We make some allowance against that for the guilty plea, albeit late, the accepted remorse and his lack of previous convictions."
Fisher appeared in court via a video link from prison.
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