A veteran Suffolk County police officer sexually assaulted a woman he’d just arrested, prosecutors charged Thursday.

Officer Christopher McCoy, 38, allegedly forced the victim to perform oral sex at the First Precinct in Wyandanch after cuffing her March 16, according to a federal court complaint filed in Long Island.

McCoy, who’s been on the force for 10 years, had just busted the woman on several outstanding warrants stemming from unresolved vehicle and traffic offenses.

The victim, who is not being identified, sued McCoy, the Suffolk County Police Department and another officer, Mark Pav, two months after the alleged assault.

In the suit, she claimed McCoy brought her to an interrogation room inside the precinct and pressed his “bulge” into her, asking “do you feel that?”

He then beckoned her to “kiss” his private parts, according to court papers.

McCoy, who is married and lives in Sayville, then allegedly forced her into the sex act – but quickly zipped up his pants and escorted her out of the room when someone walked past the door, the criminal complaint said.

Later that day, McCoy and his partner brought the victim back to the same room, where McCoy forced his penis into her mouth, telling her, “Let’s go, don’t make this hard,” according to the complaint.

Less than two weeks later, the woman began receiving texts from an unknown number – later identified as McCoy, who told her, “I put you [in] handcuffs…remember now?” when she asked the texter to identify themselves, court papers said.

She immediately went to the FBI.

McCoy initially denied sexually assaulting the woman – but confessed when FBI agents took a DNA swab from him in April.

He was suspended without pay that month.

A forensic examiner later matched McCoy’s DNA to a sample of a stain on the victim’s shirt.

McCoy appeared in Central Islip federal court Thursday, where his father Joseph posted $500,000 bail.

He faces up to 10 years behind bars, if convicted.

Pav has not been charged.

“It’s not appropriate to comment on the reliability of this complaining witness or the $40 million lawsuit she filed so quickly,” said McCoy’s attorneys Edward Sapone and William Petrillo.

“Officer McCoy had served the community without incident for 12 years. We will have a lot to say at the appropriate time in court as the case unfolds.”

The victim’s lawyer Brian Egan vowed to move forward with the suit.

“We intend to continue to vigorously pursue the victim’s civil rights violations not only against officer McCoy, but we will hold the county responsible for this obvious supervisory failure that allowed this officer to remain on the streets,” he said.

Officials from the Suffolk County PD did not immediately return messages.