Adrian, if he did it to you, he'll do it to someone else. In fact, it wouldn't surprise me at all to find out that you aren't his first victim, and that's what you are, a victim.
It's not up to you what will happen. Just like you can't consent to sex, you also can't change the laws or the punishment for breaking those laws. He needs to be held accountable for his actions. What happens the next time he tries to do this to someone? What if that person doesn't consent? Do you think that would stop him? I don't.
What happens if he decides to do this to one of his kids? Men like this don't have boundaries, they need someone to be brave enough to put a stop to their actions.
This is not your fault, but... harshness alert... if you don't tell someone, if you don't say anything, and he does this to someone else, that would be your fault, just because you didn't do the right thing. You owe it not only to yourself, but to every other potential victim of this man, to do the right thing and report him.