Around 5,000 women and girls from the religious minority were abducted by the brutal regime last year, with the terror group creating a system of sex slavery – which included sales contracts that were processed through its infamous court system.
The 12-year-old girl has since escaped to a refugee camp after a harrowing 11 months in captivity.
She said: "I kept telling him it hurts - please stop. He told me that according to Islam he is allowed to rape an unbeliever. He said that by raping me, he is drawing closer to God."
Another 15-year-old girl who escaped after nine months of slavery under ISIS said that every time her attacker came to rape her "he would pray".
She said: "He said that raping me is his prayer to God. I said to him, `What you’re doing to me is wrong, and it will not bring you closer to God.`
"And he said, `No, it’s allowed. It’s halal.`
The immoral group has made raping Yazidi women and girls a large part of its wicked culture - using warehouses to hold its victims, having viewing rooms for inspections and moving them around via a fleet of buses.
It has helped ISIS recruit men from conservative Muslim societies, which ban causal sex and dating.
Former Islamist Alyas Karmani recently claimed that young British Muslims are joining the abhorrent terror group because they want sex.
The UK-based preacher said that the young Muslims feel isolated in "sexualised" British society, because they lack the same freedoms enjoyed by young Western teenagers.
The Bradford preacher - who tours the UK to help stop young Muslims from turning to ISIS - claimed that the surge in British Muslims joining ISIS is "all about sex".
Last week ISIS fanatics savagely executed 19 women for refusing to have sex with them.
The terror group killed the women hostages because they refused to "participate in the practice of sexual jihad", according to a Kurdish official.
They were being held captive in the Iraqi city of Mosul, which is one of ISIS`s last major strongholds.
Kurdish Democratic Party spokesman Said Mimousini said: "ISIS executed 19 women in the city of Mosul during the past two days. The penalty decision came on the background of the refusal to participate in the practice of sexual jihad."
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