She said she briefly thought it might be her boyfriend coming to apologise before realising he did not have a key and then seeing a man dressed in black “from head to toe”, armed with a knife.
In what would become a prolonged ordeal, she described being raped three times – in her bedroom and at the apartment’s breakfast bar.
“I have had three children and I have never felt that pain,” she told the court.
Ms Behan, who became emotional during parts of her testimony, recalled being tied up and whipped – with the attacker filming part of the assault.
She said the man, more than once, ordered her not to scream and asked if she was scared.
She added that he spoke English with a German accent, had piercing blue eyes and a mark on his thigh.
At one point she feared he would “chop my head off” but she eventually saw him flee through the balcony door.
In the weeks prior, money she kept in a box under her bed had been stolen which had left her feeling “unsafe” in the apartment.
Ms Behan talked about the alleged callous treatment she would go on to receive by Portuguese police handling her case.
At a scheduled appointment, she said officers chatted to each other, one of them with his feet on the desk, before they “threw” some of her belongings at her.