Concerns about Corston were raised in September 2024 when a colleague at the school saw an OnlyFans notification on her phone.
She declared that she had an account, which involved nudity but not sexual acts, the report said.
It was also not in her personal name.
Corston – who regularly worked at the school on an agency basis from November 2022 – closed the account when asked.
The Teaching Regulations Agency said she had initially alluded to the right to a private life, though later accepted her behaviour was wrong.
In January 2025, the agency she worked for, Engage Education, was notified that she had been identified on a pornographic website engaging in sexual activity.