A 15-year-old boy from Birmingham accused of raping and abusing a younger sister has told a court he did not touch her in a sexual way.
Social services were alerted last summer when the girl, now aged seven, told her mother she had been touched indecently by an elder brother.
The boy denies raping and assaulting his sister between 2006 and 2009.
He told jurors at Birmingham Crown Court earlier: "There hasn't been anything sexual".
He was referring to an incident at night when he was found with his sister, then aged six, in the play room at their home in Birmingham.
"I remember she (their mother) was shouting and saying how come we were not in bed.
"Then she called me to go to the bottom of the stairs and she went up to her room while I was downstairs," he said.
His mother told the court on Monday that her 13-year-old son told her he had seen his elder brother lying on top of the girl.
An older sister of the alleged rape victim previously told jurors she had been assaulted by her 15-year-old brother at home and in the home of a relative.
He denies two charges of rape and four charges of sexually assaulting a child. His brother, 13, denies two counts of rape and two counts of sexual assault.
The trial continues.