Two pretty blond English teachers allegedly gave a 16-year-old student a steamy private lesson in French — focusing on the phrase ménage à trois.

Rachel Respess, 24, took the teen back to her suburban New Orleans apartment on Sept. 12 and teamed up with fellow teacher Shelley Dufresne, 32, for an illicit three-way romp, cops charge.

Officials said Respess sneaked away with the schoolboy after a football game — and that the kinky liaison with Dufresne lasted until the wee hours the next morning.

Not surprisingly, the teen bragged about his exploits soon after he got back to classes at Destrehan High School, in Kenner, Louisiana. He told “other students that he was having a sexual relationship with teachers,” the St. Charles Parish sheriff’s office said.

Once word of the three-way got out, police were called and the boy — who was just shy of his 17th birthday at the time of the alleged sex — revealed the tryst with Dufresne and Respess, his current and former English teachers.

In Louisiana, the legal age of consent is 17, meaning the two women could face up to 17¹/₂ years in prison for numerous charges including carnal knowledge of a juvenile, indecent behavior with a juvenile and contributing to the delinquency of a juvenile.

Students told local TV station WGNO that the trio had been fooling around for a while, and authorities are still investigating to find out just how long the alleged sexcapades lasted.

“No matter what sex the victim is, everyone should be outraged,” Kenner Police Chief Michael Glaser told the Times-Picayune. “You have an educator. Their responsibility is the safety and the education of children . . . They should have known better.”

Dufresne, a mother of three young children, has been teaching at the school for a decade, and Respess just started her second year there.

They posted $7,000 cash bonds, with Dufresne being released Wednesday night and Respess early Thursday.

With Post Wire Services