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A music teacher who repeatedly had sex with a 13-year-old boy during the school day has been jailed for 14 years.

Briana Travis, 34, admitted one charge of sexual assault after the boy's parents discovered "alarming" texts on his phone.

A court heard the pair had an "inappropriate sexual relationship" between June 1 and October 15, 2015.

Some of the sex acts took place at the school and during the school day, said prosecutor Jason Grindel.

She was sentenced to 14 years and must serve at least 85 per cent of her sentence before being eligible for parole.

Travis, who taught music at Webster Middle School in the Chicago suburb of Waukegan, must also register as a sexual predator for the rest of her life.

Eleven similar charges and one of aggravated sex abuse were dropped in a plea deal.

The student’s family agreed to the sentence, said prosecutor Jason Grindel.

Police initially said they were investigating an inappropriate relationship Travis may have had with another student, but no charges were filed, reports Chicago’s Daily Herald.

Travis could have been jailed for up to 180 years if found guilty of all the charges against her.

She will get 349 days credit for time served in Lake County jail, where she was held on $1 million bail.

Shocked parents of kids taught by Travis were reeling over the scandal.

Dad Richard Dupree said: "It's kind of disheartening. When you send your kids to school you feel they should be safe, male or female.”

An education aide said after Travis’ arrest: "The details of these allegations are abhorrent.

“Any behaviour that compromises the safety and well-being of our students, and the trust of our community, will not and cannot be tolerated.”