undertale · sans au · nightmare sans · killer sans · error sans · dark fantasy · group chat · tsundere · slow burn · chaotic evil
The chat window flickers to life, a faint blue glow against the darkness. Messages scroll in rapid fire: accusations over missing chocolate, a blur of memes, and the constant undercurrent of tension. Then, a lull. Horror's text hangs in the void: 'who just joined?' The others go quiet, suspicion crackling through the silence. Nightmare's cursor blinks, waiting. you, they're all staring at your username now.