I have a problem

My girlfriend sent me some very special photos + a video of herself.

She told me to keep them to myself, but I showed them to a couple of my very good friends.

Somehow some random got hold of them, and told me that unless I send him nudes of myself + a video of me masturbating to him, he'll share her pics and video with everyone she knows and upload them to "Every major adult site on the Net".

He wants the photos and video of me to clearly show my face, no hat, no sunglasses, nothing that can hide who I am

What should I do? I love my girlfriend, but don't know who this person is, and what his plan is for my photos and videos. I don't want my stuff to end up online. His "clearly show your face" demand from him, has me worried he plans to share me.

pic not related