A Brooklyn high school English teacher who was supposed to be tutoring a 16-year-old student instead had pot-fueled sex romps with him in school and her SUV, the boy’s lawyer charged today.

Teacher Erin Sayar, 36, had sex with then 16-year-old Kevin Eng at least eight times, “including times that occurred on school grounds in teacher Erin Sayar’s office,” according to a $10 million notice of claim filed by lawyer Bruce Baron.

Sayar — a married mother of a young girl — also plied the teen with pot she stashed in her office filing cabinet, Baron said.

Sayar arranged to tutor the boy twice a week in her office, but one day last November the boy’s girlfriend spotted them flirting and got suspicious, the sources said.

The girl hacked the teen’s Facebook account and found messages to Sayar that said, “i love you so much” and “I always loved you, since last year.”

Sayar responded, “oh no – I’m not putting myself out there again. I made that mistake last night and you couldn’t handle it.”

But she gave the teen her cell number and ordered him to delete their exchanges, the report said.

The girl turned the messages over to school officials, and her boyfriend admitted to investigators he had sex with Sayar eight to 12 times.

In one midnight rendezvous, she came to his house and picked him up in her SUV.

“Eventually, they began kissing and then engaged in sexual intercourse and oral sex inside the SUV,” the report said, adding that the boy described tattoos on intimate parts of Sayar’s body.

Through her attorney, Sayar declined to speak with investigators. She couldn’t be reached today.

School investigators recommended she be fired and referred the case to Brooklyn DA Charles Hynes.

Sayar – whose salary is $78,885 a year – taught at James Madison since 2000 but was reassigned in January.

Eng, who is now 17, remains enrolled at the school, the sources said.

Baron said the pair last had sex in January, and he filed a late notice of claim on behalf of Eng and his mother Maureen Eng because the 90-day limit to file had expired.

He argued if court denies the late notice, it will be unjust to Kevin Eng, who was robbed “of his innocence” and made the “subject of scorn and ridicule in the community.”

The embarrassing revelations were only the latest sex shocker to rock the Bedford Avenue high school.

Romance-language teachers Cindy Mauro and Alini Brito were fired for allegedly getting naked and having sex in a classroom after they were spotted by a janitor.

And English teacher Craig Roffman was fired and arrested after thousands of kiddie-porn images were found on his home computer.

Roffman apologized and got off with a slap on the wrist when he was sentenced to serve just four month’s worth of weekends in jail.

Also today, a separate investigation found that 45-year-old Brooklyn high school teacher asked a 16-year-old female student out to eat and to the movies and made inappropriate comments to her and other students about girls in skimpy outfits

George Westinghouse shop teacher Michael Aquinodenied all the charges, and has been referred to the DOE for discipline.