The guardian of one of paedophile Aaron Ellmers' victims says he is a manipulative and cunning offender who should never be freed from prison.
Ellmers, 41, pleaded guilty last week to 60 child-sex offences.
The woman, who lives with the victim and his father, said Ellmers started visiting them after he returned to New Zealand from Australia in 2008.
None of the family knew he had been convicted of sexually abusing an 8-year-old boy in Queensland and had served just half of a five-year sentence.
The woman was visited by police in October, after Ellmers was arrested in Christchurch, where he had flown to pay a man $500 to have sex with his 18-month-old son.
The guardian said that, about a year after Ellmers' return from Australia, he was taking the boy - who is now a teenager - out for days in his truck and having him to stay at his home.
"He's been quite clever in how he's built up everyone's trust."
She never observed any change in the boy's behaviour that would have indicated any offending had occurred.
"I never noticed anything. He seems to be OK now. He has plenty of family support which will help him a lot.
"It's been a very difficult time. The police have been absolutely amazing. They've been a great help."
She said she had known Ellmers for a long time and had always regarded him as a braggart.
"He's always bragged about things that turned out not to be true."
Ellmers will be sentenced in the High Court at Napier in May. The woman said she felt his offending warranted a sentence of preventive detention, which would see him subject to conditions for the rest of his life.
"I don't think he should ever get out . . . I think there will always be a risk with this man."
She advised parents to be wary of any adult who spent more time with their children than them, and to question the rationale behind any expensive gifts.
"You're better safe than sorry."
- © Fairfax NZ News