It would be hard to find a worse first-day-of-work story than Matthias Ameer’s.

In a new Queens lawsuit, Ameer tells the tale of a cocaine-snorting male boss who allegedly surprised him by dressing in women’s clothes, then whipped out a foot-long pink sex toy and insisted Ameer drop his pants — all while gay porn was playing on a TV in his office.

Ameer endured the bizarre sexual harassment after completing his first day on the job at Fleet Mechanical Systems, an HVAC repair company in Maspeth, in October 2017, according to the lawsuit filed on Wednesday in Manhattan federal court.

Ameer, who was then 19, had just wrapped a hard day’s work cleaning a Fleet property when he allegedly walked in on boss Thomas Fleet, 74, and a female aide snorting coke.

The woman left the office, and Fleet invited Ameer to dinner with a female friend with whom he said he’d had sex, the suit claims.

Then he told Ameer to leave the room for a few minutes while he prepared his payment for the day’s work.

Ameer was summoned back into the office about 15 minutes later, only to find his boss wearing a dress with a TV playing porn in which one man had sex with another man wearing ladies’ clothes, the suit says.

Fleet handed Ameer $250 in cash, and then allegedly instructed him to drop trou — but the teen refused.

“I gave you all that money,” Fleet allegedly said.

Ameer replied, “I don’t swing that way,” and offered to give the dough back to his boss, the suit says.

Fleet took back $150, leaving Ameer with $100, and told him, “Don’t knock until you try it,” in an apparent reference to sex with a cross-dressing man, the suit claims.

If that wasn’t enough, Fleet then allegedly pulled a foot-long dildo out from his rear end, according to court papers.

Ameer says he immediately ran from the office. He has since moved to Maryland.

“This was the last day Plaintiff ever saw defendant Fleet,” according to the suit.

Ameer is suing Fleet for discrimination and retaliation. He is seeking damages, lost wages, attorney’s fees and a trial by jury.

“In a power relationship, in a private setting, an employer can feel empowered to financially leverage their employees. Wealthier older white men, they feel no one is going to believe [accusers],” said Ameer’s lawyer, Ishan Dave.

“When they meet resistance, they leverage the financial power. ‘I gave you this money, now be game.’ ”

Fleet did not return requests for comment on the lawsuit left with an employee at his Maspeth office on Thursday.

Additional reporting by Lia Eustachewich and Kevin Sheehan