You lied about your age, but then told the truth. While the age gap is legally wrong, you made your decision and so did he. You said yourself that there was a thorough conversation about the implications and that thing went at a pace you were comfortable with. This honestly sounds like you being a willing and consensual participant to someone with who is into stuff like this.

I don’t know shit about the law especially when it comes to predators and SA but I will say this. If you are fine with this and don’t feel like a victim, then don’t make yourself into one or let anyone gaslight into thinking otherwise. And suck ass to everyone who wants to go around saying she deserved it because she lied about her age.