A convicted sex offender was arrested after he was found naked Thursday with a teenage boy he had arranged to meet via a cellphone app, Suffolk County police said.

Kieran Bunce, 48, of Yarmouth Street in Melville, was arraigned Friday on two felony counts of second-degree criminal sexual act and misdemeanor first-degree endangering the welfare of a child. His bail was set at $100,000 cash or $200,000 bond at First District Court in Central Islip.

Assistant District Attorney Veronica McMahon said in court that Bunce had engaged in oral sex with the 14-year-old boy.

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Bunce’s attorney, Melissa S. Aguanno of Sag Harbor, entered a not-guilty plea on behalf of her client. Aguanno and Bunce’s parents declined to comment after the arraignment.

Police said Fourth Precinct Officer Dennis Lynch spotted Bunce’s vehicle in a darkened part of the Fort Salonga Shopping Center at 12:10 a.m. Thursday.

The officer observed that Bunce and the boy, 14, who were in the car, had their clothes off, police said, and Fourth Precinct detectives determined that “sexual contact” had occurred.

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Bunce is due back in court on Feb. 2.

Bunce was classified as a Level 1 sex offender, someone with a low risk of being a repeat offender, after he was convicted in 2004 of misdemeanor sexual misconduct with a boy, 16, according to Parents for Megan’s Law, a Ronkonkoma-based nonprofit that provides help for child victims of sex crimes.

He was sentenced to 6 years’ probation, according to the nonprofit’s list of sex offenders.

Detectives ask anyone with information about other potential victims to call them at 631-854-8452.

With Darran Simon