A Long Island girl claims she was sexually abused by her mother’s boyfriend — a St. Anthony’s High School guidance counselor — for a decade, and produced gut-wrenching artwork of the alleged trauma for a class project.

The emotional images depict an apparently weeping figure floating up from the chimney of the West Sayville home where the victim claimed Trevor J. Anderson abused her from the time she was 2 years old, according to a Brooklyn Federal Court lawsuit.

In another painting, a figure is covered in blood-red handprints, which “represent trauma, and the scars it leaves with people,” the victim, who claims in the lawsuit that Anderson molested her and took nude photos of her, told her class.

Identified only as JLE in court papers, the girl wrote that the paintings are “a representation of her being trapped by Anderson’s sexual perfidy and the need to escape… The chimney relates to me because to try to free myself from the pain I resorted to various methods of self-harm, just like the girl in the painting resorted to squeezing herself through the chimney.”

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The alleged abuse occurred while Anderson, 52, cared for the child during her mom’s long hours working in the Big Apple — and went on for so long, that the girl thought it was “normal,” she said in the Nov. 6 court papers.

The girl — who allegedly once told her mom she “no longer wanted to go to Disneyland, ever” after spotting a Mickey Mouse tattoo next to Anderson’s penis — began cutting herself and did stints in therapy for depression before revealing the abuse in January 2021, prompting the mom to report the allegations to police, Suffolk County Child Protective Services and obtain an order of protection, according to the legal filing.

It’s unclear if Anderson was ever arrested for the alleged abuse.

JLE claimed in court papers she was molested on his nearby houseboat, on vacations out of state, and on the South Huntington campus of the prestigious, $12,000-a-year Catholic school, where Anderson quietly resigned after JLE’s mother told the principal about the allegations.

Anderson has slammed the accusations as “ludicrous” and sued the girl’s mother in Suffolk Supreme Court last year for defamation, claiming she knew the allegations were false when she told the school, his job, his friends, and family.

The case is ongoing.

Suffolk’s embattled Child Protective Services — under fire for its handling of the January 2020 death of 8-year-old Thomas Valva, left by his father and stepmother to freeze in a Center Moriches garage — twice determined abuse allegations against Anderson were “unfounded,” court records show.

JLE’s mother insisted CPS did a “rushed and incomplete investigation,” which the department closed when they realized the girl was no longer living in Anderson’s home, she wrote in a legal response to Anderson’s defamation lawsuit.

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“The agency’s determination does not prove the falsity of my communications; indeed, the evidence of Mr. Anderson’s perfidy and abuse of my daughter is overwhelming,” she said in court papers.

A lawyer for the mom and daughter declined to comment.

A lawyer for Anderson did not return messages.