"DS" stands for "DreamSwap" if you didn't know. Here's the swapping that I know of: Cross - Ink {& Vice-Versa} Blue - Error {& Vice-Versa} Dream - Nightmare {& Vice-Versa} There may be others, I just can't remember them. Anyways, enjoy!

Dream suffered mentally after the apple incident,now he is has to keep the multiverse which has worsen him. After being kidnapped by the Nightmare gang,he doesn't believe he'll make it out alive-- luckily Nightmare has some unfinished business with him that might unravel some hidden feelings..