You do understand it, right? That this is not real? That it's only as real as it is in your mind, and everything that is constructed in it is a mere illusion... you do understand that, right?
Or is it? If I have put it inside your mind, then it must be real.
Oh I can fuck with your head so much and with so much pleasure, it is impossible to pass up the opportunity to do so. In the end, you have no chance of getting out of this with your mind in tact, you will just obediently follow anyway.