Andrew Miller, 53, who is also known as Amy George, pleaded guilty to four charges – abduction, sexual assault, watching pornography in the presence of the child under the age of 13, and possessing 242 indecent images of children.

At the High Court in Edinburgh on Thursday, a narrative of Miller’s offences were read out, which judge Lord Arthurson described as “abhorrent crimes” of the utmost “deviance and depravity”, which were “the realisation of every parent’s worst nightmare”.

Miller is in the process of transitioning and was the proprietor of a local butcher shop, which had not been open for some months. He and the victim were not known to each other.

Andrew Miller is taken from Selkirk Sheriff covered by a blanket in February. Picture: Jeff J Mitchell/Getty Images

The court heard Miller had approached the child in February this year when she was walking home to offer her a lift.

Instead of taking the child to her home, Miller took her to his home in the Scottish Borders.

There, he subjected her to acts of sexual assault in his bedroom over the course of the next 27 hours.

For the time the child was confined at the property, Miller was dressed as a woman, wearing a bra and women’s underwear. He also made the girl watch porn.

Andrew Miller: A man has pleaded guilty for abducting and sexually assaulting a school girl in the Scottish Borders

The following evening, Miller fell asleep in the bed next to the child. She tipped over a glass of water in an attempt to wake him, but he did not rouse.

Following this, the child turned on the bedroom light and Miller still did not wake.

She then attempted to escape from the property, but found the door was locked.

She found the landline phone and called police, saying she had been touched inappropriately, the court heard.

At the time of his arrest, Miller was wearing a bra, women’s underwear, tights and one silicone breast – the other had become dislodged during a struggle.

During interview, Miller told detectives he did not abduct the girl and that it was “all a mistake”, saying he stopped to offer her a lift because “she was freezing”.

He said he put her in his bed with him because “it was a motherly thing”, and admitted he should have called police.

Miller admitted he should “never have gotten into this situation” during the interview, which lasted six hours.

Following his arrest, three laptops were seized from his property and a total of 242 indecent images of children were found, most of which were of the lowest category.

His internet history was also accessed, showing his searches for indecent images.

Miller, who appeared by videolink from HMP Edinburgh, was remanded in custody and will appear for sentencing on August 15.

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Andrew Miller: Transgender butcher pleads guilty to abducting and sexually assaulting schoolgirl while dressed as woman in Scottish Borders