Grigori/Watcher Demon/Fallen Angel

Perhaps you don't see it when ou turn your gift off because you are essentialy suppressing your spiritual energy. Which makes you of little interest. When you turn it on there is obviously and increase in energy which makes you infinitely more interesting. Most humans even if they could control their spiritual energy wouldn't have enough to see it. You apparently do.

I'm not saying it doesn't remain when you turn it off. It could be that you possess just enough energy for the spirtual world do be visible without fully eliminating the veil. When you supress it it whitles down to nothing, so it's either imperceptable or uninterested. Or the on and off switch may be what is interesting.

My take is he is supressing his enrgy to a significant amount as well. If he released it then it would most likely overwhelm you if you believe this thing is what you say he is. He's obviousl interested but not adversely affecting you. Supress your enrgy for awhile and perhaps he'll become uninterested and leave.