A woman was so accustomed to being raped by her stepfather she "just let it happen", a jury has heard.
The Belfast Crown Court jury of nine men and three women also heard claims that the abuse began when the now 29-year-old woman was around 11 and that although the indictment of charges ends when she was 17, the abuse continued.
The court heard three children had been born to the victim and the defendant.
"It's not that it finished," prosecuting lawyer Kate McKay told the court.
"But she will say that she got so used to it that she did not object, she just let it happen."
The 48-year-old Belfast man, who cannot be identified to protect his alleged victim, denies a total of 12 sex charges, including rape, indecent assault and gross indecency, all alleged to have occurred on dates between February 2, 1995 and February 5, 2003.
Although the abuse began with the victim being touched inappropriately, Ms McKay said it "escalated to other matters".
Those "other matters" amounted to the victim having to touch her stepfather, perform sexual acts on him and full sexual intercourse, the court was told.
When arrested and interviewed after the allegations came to light, the man denied doing anything sexual with his stepdaughter until she was around 19 years old, when they began a "man/woman relationship".
Ms McKay revealed the defendant and his stepdaughter had three children together – the first of which was born when she was 17.
The lawyer added that, according to the victim, "she could not break away" from her stepfather so "just let it happen".
The trial continues.