"I woke up several times to find his fingers inside me," she said of the alleged rape by the eldest son of Norway's crown princess, the Norwegian newspaper Verdens Gang reported.
The woman said she had travelled with friends for a weekend trip to Oslo in November 2024 to attend a concert by the band Aqua and met Høiby through an acquaintance.
The two grew closer during drinking games in which they exchanged items of clothing, as well as through conversation.
Later, she testified, they had consensual sex at the hotel where she was staying.
However, the atmosphere suddenly changed, she told Verdens Gang: "He seemed obsessed with my lower body and as if he would never stop."
She said she thought she saw flashes of light and immediately suspected they were coming from Høiby's camera.
She only contacted police later, after hearing about other alleged victims of Høiby, the report from the Oslo District Court said.
Investigators said they found that 27 videos had been recorded during the night and early morning.
Høiby faces a total of 38 charges, including four counts of rape, in a case that has shocked Norway and drawn global media attention. The trial began on February 3.
The 29-year-old has denied the rape allegations, as well as other sexual offences included in the indictment.
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