THE family of a boy whose sixth-grade teacher allegedly performed oral sex on him in school slammed the woman as a “monster,” according to reports.

The victim’s father and stepmother — who didn’t want to be identified — broke their silence Thursday over allegations that Brittany Zamora, a Las Brisas Academy Elementary School teacher, had sex with the 13-year-old student in Goodyear, Arizona, AZFamily reported.

“You teach your kids there’s no such thing as monsters at all,” the dad told the site. “But in the real world, there are monsters. Brittany Zamora is a monster.”

The New York Post reports that Zamora, 27, was arrested last week after the teen’s parents discovered text messages suggesting the two were in a sexual relationship, authorities said.

“He said that it started in a classroom chat group where she would talk to him, and then flirted with him, and it just progressed from there,” the boy’s stepmum said.

Authorities said the pair allegedly had sex three times between February 1 and March 8 in encounters on and off school grounds.

“He was taken advantage of,” the boy’s stepmum told the site. “She was just using him for her own grotesque benefits.”

The family may also file a civil lawsuit against the school district, according to AZFamily. They said the incidents have taken an emotional toll on their son.

“A big thing for us is that we want people to understand, just because it’s a boy makes no difference,” his dad told the site. “It’s the same. It’s a 13-year-old child who got taken advantage (of) by a monster.”

Zamora, who remains behind bars, was also booked on charges of sexual molestation of a child, furnishing harmful material and sexual conduct with a minor. She is being held on $US250,000 ($325,000) bond.

“I want her to spend the rest of her life in prison,” said the victim’s father. “I want the school to be held accountable for what they’ve done and change rules and make it to where this can never happen to parents, another parent’s child.”