Mayor Eric Adam’s sexual assault accuser on Monday detailed in new court papers allegations of the hizzoner seeking a sexual favor from her when he was cop in 1993 in exchange for helping her in her career.

Lorna Beach-Mathura claimed she asked Adams for help – as he was the leader of the Transit Bureau NYPD Guardians Association which fights for rights of black employees – since she’d been passed over for promotion as a black woman in the NYPD.

“Defendant Adams preyed on her perceived vulnerability, demanding a quid pro quo sexual favor and sexually assaulting Plaintiff, revealing himself not to be the ‘Guardian’ he purported to be, but a predator,” charges the suit filed in Manhattan Supreme Court Monday.

Beach-Mathura claims that Adams drove “her to a vacant lot and request[ed] oral sex from her,” and when she refused he put her hand on his “erect penis,” the filing alleges.

When she took her hand away, Adams allegedly “masturbated himself” and “ejaculated on her,” the papers claim.

Adams denied knowing Beach-Mathrua and denied the incident ever happened when the woman initially filed a summons against him in November.

“It did not happen. That’s not who I am. That’s not who I am in my professional life. It’s just something that never took place,” he said at the time.