Please, please, don't get in contact with him. You'll make it much harder for the police to use a range of charges that they currently can, and complicate the situation for the courts.
I have to post and run right now, but I'm involved currently in a case of harassment, and so called revenge porn that all happened over one week.
The video was previously made consensually and they were both adults, he sent it to her husband when she broke of the affair.
He denied sending it and various messages because he's into tec and believed the evidence self erased and they wouldn't be able to find proof. Trust me there's lots of ways and these men aren't as smart as they think they are.
The police have taken it very seriously, and he's denied bail and been remanded in custody over a month, while they went looking for that evidence.
As whats happened to you was made non consensually and is of an underage rvictim, I should think they'll take it very seriously indeed.
There are actually so many different charges that can be thrown at him for this, which is why I'm saying please don't contact him, because right now there is a clear trail of an out of the blue malicious communication offense, and harassment, just as a starting point. You want the charges that attract the highest sentencing options, and you might muddy those waters if you get in contact.
I realize you must be feeling awful, but everyone involved in the events I'm caught up in have nothing but sympathy for the woman this has been done to, btw, and her situation and circumstances are rather more awkward and question raising than yours.