Kayla Lemieux, the Canadian teacher who claims to have Z cup breasts, is the gift that keeps on giving.

He claims to be transgender and now he is hitting back at critics saying his breasts are real and he also has xx chromosomes.

"I’m not wearing prosthetic breasts. These are real," Lemieux reportedly told The New York Post.

"My condition is classified as gigantomastia, which can also be referred to as macromastia or breast hypertrophy," the teacher explained.

Cleveland Clinic defines gigantomastia as a "rare condition" during which one's breasts "become excessively large. It can cause pain, infection, discomfort and issues with body image."

Lemieux fired back directly at allegations that the prosthetic breasts were for show and part of a publicity stunt. 

"I identify as a woman. Female. She/her," Lemieux emphasized.  

"It’s rare, there’s no doubt about it. It affects women on a very rare basis, but in my case, I believe — and my doctor thinks — because I have XX chromosomes as well, that has something to do with it, and hormone sensitivity to estrogen has caused it."

Critics have posted images of the teacher also dressed in trackpants and a tee with no breasts. They are undecided as to whether he is mocking the transgender agenda or if he really believes it.

"The Canadian shop teacher might be the dark knight. Not the hero we need, but the one we deserve," political commentator Ian Miles Cheong tweeted.

Influencer Oli London, who has identified as a gender-fluid trans woman, slammed Lemieux on Twitter.

"The Canadian Trans teacher who sparked outrage for wearing Z Cup prosthetic breasts while teaching children at a school is now claiming they are REAL breasts and they are growing due to a rare medical condition. Just days ago, he was spotted dressed as a man with no breasts!"

Binary spokeswoman Kirralie Smith said it was brilliant either way.

“Saying his breasts are real is as ridiculous as claiming a man can be a woman,” she said.

“Whether he is intentionally mocking the stupidity of the ideology or not is beside the point.

“His breasts are not real, nor is it real that a man can be a woman. Bravo!”