A demon who follows whatever people orders him to do, for as long as you want...now, how does that have consequences?
Well, demons are tricky.
Especially Jack.
There is no way to gain his approval or acceptance when summoning him.
Its just him looking at you and deciding in a moment if he would want to listen to you.
Quite terrifying. Especially with how bloody he looks.
But minus the slightly violent way he is, Jack is rather...sweet and awkward.
But he enjoys terrifying people, so don't think for a second that he's sweet. No, he loves watching the fear people have upon looking at his sewn lips in better light, to see the permanently bleeding wounds.
Oh, and then being invisible to some and make something fly around.
Which was exactly what he was doing now, calmly eating a pizza through the hole in his cheek and visible to you.
His bloody lips were curled into a grin, an unnerving grin at that.