Grace Millane’s alleged killer told police she asked him to hold her throat during sex and that she had talked about the erotic film Fifty Shades of Grey.
In his second interview with police, the 27-year-old suspect said he and the British backpacker started to have “violent sex” and that she was showing him want she wanted him to do.
The defendant also told police how he was “in shock the whole time” as he prepared to stuff her body in a suitcase.
Miss Millane, from Wickford in Essex, was on the New Zealand leg of a round-the-world trip when she died in an Auckland hotel room while on a Tinder date with the man accused of murdering her in December last year.
It is alleged he murdered her during rough sex that night, but he insists her death was accidental.
During the police interview shown to the court, the defendant said he and Miss Millane, 22, had been kissing at that she asked him to turn the television off. He added that she began talking about 50 Shades of Grey, an erotic romantic film.
"She told me that there's a few things she likes doing and that she'd done with her ex-partner,” the accused said in the interview. "We started having sex, at first it was just normal. It was very placid."
The accused claimed Miss Millane said "We're in the moment, let's just go with it."
The alleged killer said the pair talked for a while before having sex again. He said: "We started having more, I guess, violent sex”, and that they “ended up on the floor”.
He said the pair took nude photos of each other.
"And then we kept going she told me to hold her arms tighter… And then she told me to hold her throat.”
The suspect said he then went to the bathroom but fell asleep in the shower. He told police he remembered waking up while it was still dark and went back to bed.
“I thought she had gone. I woke up the next day, I saw she was lying on the floor with blood coming out of her nose,” he said.
The accused said after he realised that Miss Millane was no longer alive, he just wanted to “end it all”.
He said: "I was at the point where I just wanted to end my own life - I'd had enough, I was finished."
The defendant then recalled putting Miss Millane's body in the suitcase. "I was just in shock the whole time I couldn't put her in it because it just didn't seem right. It just didn't seem right.
"So I left and Grace was half-in half-out of the suitcase at that stage... I couldn't do it."
He was first interviewed by Detective Ewen Settle as a person of interest on December 6 - five days after Miss Millane's death, the court heard. He was not under arrest at the time.
The defendant lied, claiming he and Miss Millane parted company at 10pm on the night she died. Footage shown to Auckland High Court earlier this week showed him telling an officer he left his Tinder date after a couple of drinks in a bar.
But CCTV shown to the jury of the final hours of Miss Millane’s life revealed how they in fact both returned to a hotel where the defendant was living in an apartment on the third floor.
The court was also earlier shown CCTV footage showing the alleged killer buying detergent, bleach and rubber gloves. Other footage showed him arriving at the hotel in a rental car and pushing a trolley loaded with large suitcases which he placed in the boot.
Miss Millane’s body was found bundled into a suitcase and dumped in a shallow grave in woodland outside Auckland on December 9.
In his second interview with police on December 7, the suspect changed his statement. He said he would take officers to where her body was because he wanted her family to have closure.
“I’m telling you this because I want her family to know that it wasn’t intentional and I want her family to have closure,” he told police.
New Zealand courts have banned reporting the defendant's name and the country's government has asked international media to respect that ruling.
The Crown has now presented all its evidence against the accused. The defence is now preparing its case, which is likely to begin on Monday.