Harrowing: Shirin, whose name has been changed to protect her identity, recounts her experience in her book titled, 'I remain a daughter of the light'

A young Yazidi women who was held by ISIS for nine months has described in harrowing detail how she was repeatedly raped by a man with 'swamp green eyes' after being bought from a slave warehouse.

Shirin, whose name has been changed to protect her identity, was just 17 when she and her school friends were snatched from their village of Hardan in northern Iraq by Islamist fighters in August 2014.

She was taken to an abandoned school building with some 3,000 other Yazidi women, including her mother and her sisters, where they were inspected like livestock.

Shirin, who once dreamed of becoming a lawyer, said everything inside the warehouse was 'complete chaos'.

Women and children had nowhere to sleep and so were forced to lie on the floor, their bodies pressed against each other as they struggled to find room.

Shirin, who eventually managed to escape the grasp of the terrorists and now lives in Germany, has retold her story in a new book, titled 'I remain a daughter of the light'.

Remembering the day she was first brought the the warehouse, Shirin said: 'My mother, my sisters, my brother Kemal had to step really carefully over the people lying down when we were bought in.

'We found space against a wall in the classroom and sat down next to each other, pressed closely together.

'There were guards everywhere, they were boys aged between 15 and 18, and anybody slightly older was automatically their superior.

'Those that were in charge only turned up when they wanted to look at the women.

'They turned up twice in the first three days I was there. The first time was to weigh up the value of the young, unmarried women like me.

'Muslim women of course need to make sure they are completely covered. It's a sin for a Muslim man to even look at a female's uncovered hands. If they are caught, they might even face the whip.

'But apparently it wasn't a sin for them to look at us, the ISIS leaders make no secret about what they were doing as they looked us up and down, and even stared at us straight in the eyes.'

She described the discussions as they looked at the women. One said: 'She has blue eyes, I like that'. Another commented: 'I want that one with the brown eyes'.

Cruelty: Shirin was taken to an abandoned school building with some 3,000 other Yazidi women, including her mother and her sisters, where they were inspected like livestock (file photo of freed Yazidi slave)

She added: 'If they liked the look of a girl, they would simply write their name on her. When a man asked what your name was, you had to say whose daughter you were and your full name.'

On the second day, a masked man came into the hall and started calling out the names he had taken down earlier. She said she hugged the wall and had tried to make herself invisible.

The first name called was 'Malik'. Shirin froze as if it was her own name.

'Malik was my neighbour and my friend,' she said. 'She was small but really a sweet and beautiful girl. She was a fast grower for her age. She looked older even though was only 12 years old.

'He called again, "Malik", and my friend didn't react. She hid her big brown eyes behind her curly black hair as if she was trying to hide herself.

'He then took her to task, speaking Arabic to her directly. She tried to pretend that she didn't understand and lifted her shoulders as if she didn't understand the language.

'But the man was one of our neighbours and he wanted her so he simply laughed at her.

'He told her "of course you speak Arabic, after all you went to our school didn't you? And all of us know that you are a very intelligent girl".'

Assault: Shirin described how she was taken home by a man who repeatedly raped her. She said: 'No perfume in the world could ever cover the stink. And his looks were so filthy.' File image of a free Yazidi sex slave

The next girl chosen was a 19-year-old who was known in the village for her beauty.

'She looked like snow white, she had skin like milk and beautiful long black hair,' Shirin said. 'She left to go with the men with her head bowed.'

Nine girls in total were chosen in that first session. Shirin said their mothers cried and begged for the girls not to be taken away as they were marched out of the room, never to be seen again.

She said: 'The cries were terrible, they were begging for the girls to be left behind but it was as if the men were deaf.

'One had told the mothers not to worry, saying they were going to teach them the Koran and then would bring them back.

'When women asked about their husbands and their sons, they were told they were also being converted to Islam, and said "then we will bring you together, when you are all Muslims. Allah is great and forgiving".

ISIS abducted hundreds of women and girls - and massacred thousands of men - during the siege of several Yazidi villages in northern Iraq in August 2014 (pictured, Yazidi women fleeing the attack)

'Their kindness however was false, and their words were lies. They told us that all they wanted to do with us was to teach us a better religion. What they didn't mention was that they would treat us like goats in a cage, locked up, starved and sold in the markets, and tortured like beasts.'

She described how one of the men beat her before taking her back to the market.

She said: 'The purpose of the torture was to beat any resistance from us. It was deliberate.

'It left me weak, I had nothing to eat, no water, no blankets to cover myself at night. I hated it when he would look at me with his swamp green eyes, and then he would be on top of me.

'I tried to wriggle away, but I was so weak, cold, I couldn't do it. This one was worse than the others, he stunk of sweat, and was filthy. No perfume in the world could ever cover the stink. And his looks were so filthy. He felt like dirty water.'

Shirin said the man allowed her to wear clothes when in the living room but she had to walk around naked in the bedroom.

It left me weak, I had nothing to eat, no water, no blankets to cover myself at night. I hated it when he would look at me with his swamp green eyes, and then he would be on top of me Shirin

He would stuff his fist in her mouth or hold her mouth close so that she could not scream. On occasion he would tie her mouth closed because he didn't even want to hear her speak.

He would beat her, and when she rolled herself into a ball crying he would stamp on her.

Shirin said she was also given tablets to eat without being told what they were, though she believes they were tranquilisers. 'They didn't make me sleepy, I simply passed out,' she said.

Over the coming days she was raped repeatedly. One night she was woken and told they were leaving.

The teenager was too weak to stand and when she tried she felt dizzy. She passed out and when she woke she found she had been returned to the slave warehouse.

Other girls tried to help her wash the blood from her face and treat her wounds.

She was passed on to nine husbands before the last offered to help her flee. The journey required her to walk hundreds of kilometres, much of it barefoot.

She was eventually reunited with her father in a refugee camp.

He said: 'I was so happy to see him but because we should always show respect for older people I took his hand and kissed it.

'He then took my head softly between his hands, and kissed my forehead. His eyes were glassy and red, and then we hugged.

'I told him "Papa, are you okay?" and I was crying, and I put my hands over his grey hair. He replied: "Now that I see you again, I'm okay".'

She said that her mother had briefly had contact with him but had not told him the truth, and that she had been sold as a sex slave to ISIS.

She had told him that she was a domestic servant in a Sunni Muslim household.