Papyrus joins MTT and starts to work for there, sans is happy cuz papyrus is happy, but as time went on, he figured out.......MTT dragged papyrus into a forced marriage, of course sans is angry, but he knows and believes that papyrus is happier with MTT then with him, sadly, he doesn't think that he belongs with papyrus anymore (by that I mean, "living with him") so he moves out of the house (Sorry if my writing sucks critisies ALL you want i dont care)