SALEM, Mass. (AP) — A 38-year-old married mother of two from Saugus is facing charges for allegedly having sex with a 15-year-old boy.

Heather Salines was released on $7,500 bail after pleading not guilty to aggravated child rape during her arraignment Tuesday in Salem District Court.

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The Salem News (http://bit.ly/1i27LeB ) reports that prosecutors called the boy ‘‘vulnerable’’ because his own mother had died and he saw Salines as a ‘‘mother figure.’’

The prosecutor said the case came to light after administrators at a Saugus middle school learned the boy had been showing another student nude photos Salines had sent to his cellphone.

Authorities allege the sex took place in a Middleton hotel room and Salines met the boy through her 13-year-old daughter.

Her attorney called it an ‘‘unfortunate incident’’ in court.

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Information from: The Salem (Mass.) News, http://www.salemnews.com