We don't tend to actually talk to the demons before they come into our world as abominations. Though the one I met was pretty content on being a nasty tricksy demon and intent possessing a mage boy. Though they do try to reach out and make deals and assure you that they won't cause any harm, they're simply tricky and desperate to enter our world.

[A shrug. That whole incident in the Fade was bad. You don't tend to forget demons making your friends betray you all that quickly.]