Twitter is not pleased as Harry Potter author JK Rowling reveals details about Dumbledore and Grindelwald's love affair.

According to recent reports, the author talks about the couple in a feature included in the DVD and Blu-ray versions of Fantastic Beasts: The Crimes of Grindelwald.

"Their relationship was incredibly intense. It was passionate, and it was a love relationship. But as happens in any relationship, gay or straight or whatever label we want to put on it, one never knows, really, what the other person is feeling," Rowling reportedly said.

"You can't know, you can believe you know. So I'm less interested in the sexual side -- though I believe there is a sexual dimension to this relationship -- than I am in the sense of the emotions they felt for each other, which ultimately is the most fascinating thing about all human relationships," she added.

Harry Potter fans across the world, however, is not impressed that the author has revealed explicit details about Dumbledore and Grindelwald's relationship. Many took to social media to troll Rowling for updating these details 'a little too late'.