Father forcefully subdues his gay son to teach him to learn

He knew he was a perverted, morbid and horrible man, after his children were small, he had installed in his room a security camera, at the beginning he had done it for their safety, however, when they grew up he thought about removing the camera, but a recording made him not to do it, watching his children masturbate, had turned him on too much, and despite the guilt he felt, he kept watching the recordings, he kept touching himself to the rhythm of his children masturbating in the darkness of his room. They were adults now and every time they went to visit he knew that new recordings awaited him.