Update: High Court in Glasgow hears Inverness man Kim Avis was in a "trance" during alleged sex attack on teenager
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Kim Avis was said to have pounced after the pair had been at a car boot sale in Muir of Ord in May 2016.
The 56 year-old later apparently claimed he knew he had "done wrong".
The evidence was heard today at his ongoing trial at the High Court in Glasgow.
Avis denies 25 charges spanning between January 1997 and March 2019.
The accusations include claims he raped three females. He is also said to have attempted to rape one of them when she was 12m and is further charged with sexually assaulting a girl when she was 11.
The witness – now aged 22 – was giving evidence via video-link for a second day.
She had earlier made claims in the trial of being abused at Avis's hands.
She was asked today about going to a Muir of Ord car boot sale with Avis.
The witness told how they later returned to a static caravan where she claimed Avis massaged her.
She said Avis then stated: "It's time."
Prosecutor Graeme Jessop asked her: "What did you think he meant by that?"
She replied: "I was thinking: 'Oh gosh, is he going to rape me?'."
She said she "screamed" at Avis.
She told jurors: "I remember telling him to snap out of it while trying to look at him – but there was absolutely nothing there.
"It was like he was under some sort of trance."
The witness said Avis then sexually assaulted her.
Afterwards, she said, she "constantly" asked him why he had done it.
"I think he said: 'I do not know...I think I have something wrong with me'," she said.
"I remember him saying he thought I was someone else, I had become a beautiful girl and that it was like a switch in his brain.
"He said he had head injuries as well.
"I remember him getting quite upset and him telling me that he knew he had done wrong."
The witness went on to tell a relative of the alleged incidents with Avis.
She reported him to police in 2017 along with another woman, who was also making accusations against him.
The witness had typed out a statement to hand to officers.
She told the trial: "I remember being reluctant going to the police as I was afraid what would happen."
The trial continues.