A man already in jail for sex offences against his step daughter will serve extra time for the rape of his girlfriend's kid sister.
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The man was "opportunistic" when his girlfriend's sister, about 14, came to stay at their house around 2006 or 2007, the court heard.
He was 24, and he raped her that night. But it wasn't until 2015 that the girl wrote her big sister an email, and told her what happened.
The man told the court he did not remember the assault, his memory blanked by his heavy use of drugs and alcohol that night.
"I didn't believe it," the man said about the assault, when giving evidence at his sentencing in the ACT Supreme Court on Thursday.
"I didn't take it very seriously because my memory wasn't there."
But he had changed his plea to guilty before his trial ended, and the younger sister avoided having to give evidence.
In his evidence, he detailed a difficult upbringing in and out of family homes and refuges, and a history of abusing drugs and alcohol.
But Crown prosecutor Jane Campbell, who had earlier read out an impact statement on the victim's behalf, said the assault had affected the woman's relationships with men and her family.
Ms Campbell said the girl had in the years since developed a condition that caused her to be in a wheelchair, and the condition flared up with the stress of each court appearance.
The crime was serious because it breached the young girl's trust that she would feel and be safe in her sister's home, the court heard.
The girl, now an adult, was in court on Thursday with her sister and mother, while the man was supported by his mother and father.
Defence barrister Theresa Warwick said the man, now 34, had been committed to his rehabilitation since going to jail, completing multiple education programs and holding a trusted prison job.
She argued he had good prospects of rehabilitation.
Justice John Burns had earlier this year sentenced the man to prison for incest and an act of indecency on his step daughter, committed in 2015.
On Thursday, Justice John Burns sentenced the man to two years and six months in prison for the crimes against the girl, with the combined sentences effectively adding an extra 15 months to the man's time.
He also added another 13 months to the non-parole period.
Outside court, the victim's big sister was shocked and angry. She said the sentence wasn't long enough to make amends for what her sister had to deal with for the "rest of her God damn life".
Her mother agreed, and said she did not have confidence in the prison rehabilitation system.
The man will be eligible for release in July 2019.
