Westwood denied the offenses, which took place between 2020 and 2021.
He was also convicted of assaulting a child over an eight-year period between 2010 and 2018.
Westwood, who filmed forBBCseriesDoctorsandFather Brown, will be sentenced at Wolverhampton Crown Court on February 25.
Alexander WestwoodTime Wasting/YouTube
He is a predator, prosecutor Andrew Wallace said.
When his methods were questioned, he told her: Do what your teacher says.
Westwood convinced the second teenager to undress for a Greek mythology scene.
He touched her breast and vaginal area, the court was told.
Westwood was accused of pinning her down by her wrists until she bit him to escape.
