After he made an allegation against Parker, he and a mate were pulled out of class by the teacher, who said he could lose his job because of what the boy had been telling people, the court heard.
"It was hard going back into your class and I remember crying and feeling like sh**. I remember even feeling bad inside like I had done something wrong."
Another boy said Parker had stolen his childhood.
"Every time I went to work on the farm I was worried he would do something to me. Often there were several boys there, but the abuse would only happen when I was there by myself.
"I would go home with a feeling of disgust and feeling dirty. I would spend a lot of time in the shower but even then I wouldn't feel clean.
"I hate him for what he's done and I will never forgive him."
One of the boys' mothers said she "almost died inside" when she found what Parker had done to her boy.
Crown prosecutor Michael Smith had submitted to Justice Heath that Parker should be given a sentence of preventive detention because of the risk he posed to the community.
"[His offending is], in many respects, without comparison in New Zealand's history. It is without comparison and defies summary."
Parker's lawyer Alex Witten-Hannah submitted a lengthy prison sentence would be adequate protection for society.
"The test for Your Honour is not what is the risk now but what is the risk likely to be at the end of the sentence."
In August last year Parker pleaded guilty to 49 sexual abuse charges, which prompted more complainants to come forwards.
In April this year he admitted a further 25 charges, including five allegations of sexual violation involving two boys, the most serious of the charges he faced.
