London, Nov 28 : Britain's Josef Fritzl, who fathered nine children with two of his own daughters, threatened to kill them if they told anyone about their horrific ordeal.
However, now, the women, who cannot be named for legal reasons, have given out details of their anguish.
The women told The Sun that they pretended to their mother that other men were to blame for their pregnancies.
The two were raped more than 1,000 times by their dad - dubbed 'British Josef Fritzl' after the Austrian man who fathered seven children by his own daughter - during the 28 years of hell.
The sisters revealed that they used to beg their father to stop the torture.
One said she even began paying the benefits-obsessed 56-year-old not to abuse her.
The elder sister said: "No one was there for us and we were too terrified of him to tell anyone what was happening. I pleaded for him to stop but he wouldn't. I was too scared to tell anyone.
"When my mum asked me who the father of my first child was I told her it was a local boy - but I knew the real father was my dad.
"I lost count of how many times he raped me. As I got older he said if I told anyone, my children would be taken away from me.
"He started touching me when I was about five. It was going on for years but I didn't know my younger sister was also being abused until much later. At one stage a few years ago I even paid him a few times from my benefits just to stop him. There was no way out.
"It took us years to build up the courage to report him. We were just under his control. Over the years I pleaded with him to stop but he didn't. There was no reaction or heart in him. He'd just tell us to go to the bedroom.
"Now we want to get on with our lives. We don't want anyone to know who we are."
Following the ordeal, the two women are now receiving counselling for their trauma.
The younger sister spoke to The Sun just days before her dad was charged with a catalogue of rape and abuse.
She broke down in tears, sobbing: "We love our kids more than anything in the world. Although they were born out of hate, we love them and always will. I don't know how I will be able to tell them who their father is. It is going to be very difficult."
The girls' father has been given 25 life sentences at Sheffield Crown Court.