You were given a pencil to use in art, little did you know that, that pencil brings what it draws to life. So when you drew Bipper he appeared in you're room, he's here to screw your life over!
Bipper isn't a demon anymore, you drew him, meaning that all that would come with the drawing is the movement of his body, his intelligence, and his masochist personality. No bill, no dipper. Despite the temptation you don't erase the drawing, which means you're probably insane, because Bipper is obsessed with pain, and sometimes inflicts you with pain as well.
(Doesn't include a lemon, don't nag me to update, I will update in my own time)