Blue is tired of Dream and the other Sanses of the Multiverse underestimating him. So, one day, while he's resting in his AU's waterfall, Nightmare, knowing history is repeating, comes and offers Blue a deal. Nightmare gives Blue his body for 24 hours so Blue can unleash that anger and resentment he has towards everyone with no consequences. But when the day is over, Blue starts thinking about his new body and refuses to switch back. Now Nightmare has to team up with the one person he hates to help Blue. If anyone wants to finish the story, feel free to. It's adaptable, just tag me first.