I think it should be illegal to make porn of a person without their permission regardless of if it was shared or not. Imagine the person it is based off of finds out someone is doing that. That causes mental strain on the person. Just like how revenge porn doesn't actively harm a person but causes mental strafe (both the initial upload and continued use of it). For scenario 1 it would be at step 2 when the porn is made of the person. For scenario 2 it would be a mix between step 3 and 4.