A primary school teacher who tried to have sex with one of her students got the boy's name tattooed onto her chest, a court has been told.

Diane Brimble, 47, of Hamilton in Victoria's south-west, tried to have sex with the 10-year-old boy but he rejected her advances, the Victorian County Court heard.

The boy's mother told the court Brimble, a mother of eight, turned her son into a "sexual commodity".

She said they had to move from their community and the boy was placed on antipsychotic medication.

She said it also impacted on his siblings.

"They drew pictures of rainbows and unicorns. He drew black pictures of knives and death," she said, reading her victim impact statement to the court.

The boy's father said his son would not look at his parents as he believed Brimble had cast a spell on him which allowed her to see and hear everything he did.

The father's victim impact statement was read to the court by prosecutor Patrick Bourke, who said Brimble tried to tour the boy's new school and enrol her children there.

Judge 'entirely bewildered' by teacher's motive

Judge Mark Taft said a psychological report tendered by Brimble's lawyer Jennifer Clark did not help and was essentially barracking for her.

"I remain entirely bewildered by Ms Brimble's psycho-sexual profile and her motive," Judge Taft said.

"It's an unusual case and I find Ms Brimble's conduct as bizarre as I have ever seen in a courtroom.

"We have a 45-year-old school teacher who, amongst other things, has written extraordinary material about a 10-year-old child who wasn't her own, has tattooed his name on her chest in an infinity symbol, and has engaged in a series of statements of continuing love and affection."

Judge Taft said it was not a case of misplaced maternal sentiment.

"You don't seek to have sex with your children," he said.

"This is a criminal offence, not an excess of maternal sentiment."

A jury convicted Brimble of one count of committing an indecent act on a child under 16.

She was acquitted of five other charges.

Brimble has been assessed for a community corrections order and will be sentenced on Thursday.

AAP