<human>: Can you condense the text into a few key points?

I'm not sure if this is even the right subreddit to post this in but I need some help, throwaway account for obvious reasons and I'll probably delete this thread after a while.

Tonight at around midnight my youngest sister sent a nude Snapchat of herself to a boy her age that she met on the social networking app Tinder. She has never met him in real life and doesn't know him personally (which is why I'm stunned at this whole situation). The Snapchat had her face in it and the little fucker took a screenshot of it. She realizes that he did this and freaks out and tells him to delete it, and he claims he did. She becomes very guilty about this whole thing and wakes my mom up and tells her the story, who then woke me up. 

My mom did a reverse caller ID on his phone number so we know exactly who he is, where he lives, and all of his social media information. We know he is a real kid and not just some pedophile living in his basement or a catfish or anything. My mom sent the kid a text message saying that if he sends the picture of her to anyone that we will charge him with trafficking child pornography/sexting (or whatever the formal name for the charge is) to which he responded that he understands and that he deleted it. We aren't sure if he took it seriously or not. I wanted to call him but decided against it knowing that all it would end up be is me threatening to rip his throat out. Luckily, he lives in a town decently far from us and we don't know anyone in that town or associated with it, but we still aren't 100% sure if he actually deleted it or didn't send it to any of his friends.

Is there anything else that I can do for this? I'm about to snap and don't know what else to do. This is my little sister and I feel like I failed as a brother that she sent this picture of herself.
<bot>: Sister sent a nude snapchat with her face in it to a boy she doesn't know IRL. What the hell do I do now?