angel | sam
I don't know. I can only speak to my type of demon, and obviously using my powers doesn't make me any more demonic. I'm concerned that it would be like the way drinking human blood is for me -- the more I did it, the more I wanted to do it. And if I hadn't stopped, who knows what other impulses I might have wanted to indulge?
But if teleporting doesn't make him want to hurt people, or otherwise threaten what's left of his humanity, then I guess it's not a problem.