The victim went to police a month after the episode and described how she had been woken early in the morning by banging on her front door.
Waa — nicknamed "Age" — had only met her fleetingly in the past but told her he would not leave until she let him in, she said.
The woman sought refuge in her bedroom, but Waa pursued after locking her dogs away.
She told the jury how he stripped her of her clothes and performed a sex act on her as she repeatedly told him to stop.
"Eventually, I just gave up ... I didn't have the fight anymore," the victim said at the first trial before it was aborted over an evidential issue.
Waa told her he would come back and repeat the treatment "every single day", she said.
Later in the morning he demanded the victim prepare breakfast for him and she was only able to flee the address when he fell asleep.
The defendant was unrepentant when confronted by police.
"F... that b.... This is going to start a war," he said.
Crown prosecutor Richard Smith said it was a prolonged attack and involved a variety of sex acts and "a high degree of force".
Aggravating that, he said, was the invasion of the victim's home, a place where she was entitled to feel safe.
She still feared running into Waa or his associates.
Judge Turner said she had suffered significant emotional trauma not only from the incident but from giving evidence in court.
"This was premeditated, prolonged offending, featuring a vulnerable victim and invasion of her home," he said.
Defence counsel Len Andersen QC pointed to his client's dysfunctional childhood which saw him move frequently between foster homes after his grandparents died when he was only 6 years old.
"The violence in his upbringing is reflected in what he's done," he said.
Waa was now undergoing counselling in prison and was doing a business course, the court heard.
"He says it is the first time he's taken an interest in his future," said Andersen. "If he's going to turn his life around this is going to be the time," Andersen said.
He stressed Waa was not actively involved in a gang, an issue that had been raised at trial.
The incident was not, however, the defendant's first criminal foray.
Six months earlier he was at Forsyth Barr Stadium, attending an event when one of his friends was arrested over a public brawl.
Waa stepped in and obstructed the officers, ending with a violent struggle during which he spat on a female constable.
He was sentenced to community work but had previously been incarcerated for violence in both Dunedin and Northland.
Waa was jailed for eight years four months.
Sexual harm - Where to get help
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone, contact Safe to Talk confidentially, any time 24/7:
• Call 0800 044 334
• Text 4334
• Email support@safetotalk.nz
• For more info or to web chat visit safetotalk.nz
Alternatively contact your local police station - click here for a list.
If you have been sexually assaulted, remember it's not your fault.
