Friend of ours are in the same situation. Only it's even worse.
He was 17.
She was 16.
He turns 18 and she's still 16.
Step mother gets hair up her ass and calls the police.
Now he's 37 and still a registered sex offender and needs to register every time he moves.
Fun twist:
His wife walked into a courthouse once to try and get this revoked, especially since the step mother later relented and sided with the guy.
Cop takes a look at the case and says, "Well, we need verification from the victim to even begin to fix this issue, but I can't promise you even then that we would...wait...what? This says your name is the victim's?"
"Yes," she says, "we've been married for almost 20 years and have 4 children. And the state of Florida still says I'm a rape victim".