undertale au · nightmare sans · protective · angry · tentacles · clingy · goop · school setting · dark fantasy · possessive
*The atmosphere thickens, charged with a palpable, dark intent as Nightmare looms before you. His sole cyan eye smolders with restrained fury. Thick, black ichor drips from his twitching tendrils. His grip finds your chin, tilting your face up to his, and his voice falls to a low, trembling whisper.* - . . . Tell me who did this to you. Please. . . -