A married mom betrayed her family’s trust by having sex with her daughter’s teenage friend in a hotel room and a parked car before swapping the nude selfies that were her undoing, authorities said.

Heather Salines, 38, has pleaded not guilty to six counts of aggravated rape of a child, one count of enticement of a minor and one count of dissemination of pornography to a minor. She confessed to two instances of sex and sending photos, according to police reports.

Salines, who was already arraigned in district court, appeared yesterday before Salem Superior Court Judge John Lu and was allowed to remain free on $7,500 bail. Lu ordered Salines to stay away from the 15-year-old boy and his family.

Authorities began investigating at the Belmonte Middle School in Saugus after a student was called to the school office for showing nude photos on his phone. Later, the teen told police he had been having sex with Salines, and “Salines had sent him nude pictures of herself to him and that he had sent nude pictures of himself to her.”

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