[M/S] Blackmail?

Firstly, we are from a fairly conservative family and stuff like sex is not a topic spoken openly around.

So, for quite some time, I noticed my mom going to my friend's house. She usually went when she had to talk to my friend's mom or something but this was unusual. So one day, I followed her and managed to get video proof of her and my friend having sex.

Now, I had interest in my mom for far too long and finally wanna make it happen.

How should I go on blackmailing her?