Nightmare had always been the leader of the bad sans. But of course, he's kept plenty of secrets about his corrupt form. Such as the fact his corrupt form was capable of shapeshifting. He just really preferred to not shapeshift but if it was absolutely necessary, he would. But one day, Nightmare doesn't leave his bedroom for a while which concerns some of his minions. Nightmare however, wasn't leaving because well, something made his sans form a bit weak so for temporary purposes, he had to be in the form of a wolf. He could still speak but he was stuck in his room since he couldn't open the door with his paws. But what happens if Cross happens to go into Nightmare's room to check on his senpai, only to find his senpai was now a wolf? How would Cross react?
//I wanna be Nightmare for this//
Also this is what Nightmare's wolf form looks like:
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