Porirua school teacher Stacey Reriti, 31, was found guilty of seven sex charges against a boy.

A Porirua school teacher who sexually violated a boy has been jailed for 10 years and six months.

In sentencing Stacey Reriti, 31, in the High Court at Wellington on Friday, Justice Mark Woolford also reprimanded her for sending a second underage child pictures of her breasts when he asked for them.

Reriti had been the co-deputy principal at Natone Park School during the offending that began when her victim was 10.

Reriti was earlier found guilty by a jury at trial of seven sex abuse charges against the boy, who is now 14.

The jury rejecting her claims that he had lied.

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The court heard that she had sex with the boy in a Paraparaumu motel when he was 12, performed other sex acts, kissed him and shared intimate photos and text messages during three years of offending, starting in 2011.

The boy told the jury he willingly had sex with her and said that she told him that she became pregnant to him, but later had an abortion.

A fellow teacher's complaint to police after finding an inappropriate text message from Reriti on the boy's phone led to her arrest.

Reriti told the trial the boy was a liar, labelling his claims "disgusting".

Woolford sentenced her to 10 years and six months imprisonment, saying Reriti had breached the victim's trust and groomed him for sex, as well as causing great harm to the victim, his family and the school community.

At sentencing, Crown lawyer Dale La Hood said Reriti had exploited the vulnerability of her victim and groomed him for the final sex act.

He asked the judge to make no distinction on Reriti's gender, asking him to consider how the court would treat a male teacher who had committed the same crimes.

Reriti's lawyer Stephen Iorns said Reriti had serious mental health issues.

"It is an inescapable conclusion that the illness had some bearing on this offending if not being a causative factor."

Iorns said the court had heard she was on track for a "very successful" teaching career and had no previous convictions.

Woolford said there was no evidence offered to support the submission about any psychiatric conditions, however he acknowledged her mental health issues and made reductions in her sentence.

Reriti's threats to the boy that she would tell the police if he ceased contact with her demonstrated premeditation, the judge said.

Her Facebook and text messages to him, calling him a "bad boyfriend", was evidence of grooming and manipulation.

"Some of the texts were extremely sexually explicit. You told him that you loved him. You also requested naked pictures of him."

A victim impact statement from the boy outlined the stress her offending and the trial had put him under.

"He stated that he has been labelled a liar over the offending and his reporting of the relationship."

It had also taken a toll on his family and harmed the school community.

"Understandably he is angry at you, Ms Reriti, he feels that his childhood has been taken from him and he struggles to see that anything positive could come out of what has happened."

A statement from another relative said "your actions will be a scar on their lives forever," Woolford told Reriti.

In sentencing Reriti, Woolford noted women cannot be charged with rape so a charge of sexual violation by unlawful sexual connection was used instead.

However what happened in the motel might be "colloquially if not legally known as rape," Woolford said.

The judge declined to impose a minimum period of imprisonment – which means Reriti will be eligible to apply for parole after serving one third of her sentence.