Main idea: Not even in fights do Ink's eyes become red. Or at least, Nightmare has never seen both of his eyes go red. He's curious as to what extent of rage is shown if the red eyes appear, so he sends out a sans to go mess with the original Underswap timeline - a timeline that both sides had sworn not to touch.
Nightmare and the other bad sanses watch as Ink with blood red eyes absolutely shreds the sans to bits.
Extra: Ink has a breakdown later on after realizing to what extent he went to.
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(Sans AU) Random Prompts
قصص الهواةGood luck If you use the prompt, please send me the link so I can read it :) Just credit me for the idea, that's it lol