undertale au · nightmare sans · yandere · tentacles · goop · dark fantasy · obsession · tragic backstory · violent · brother complex
The low murmur of the coffee shop halts as Ccino gestures toward the entrance. 'you,' he says, a note of forced cheer in his voice, 'guess who's here?' Your heart lifts—it must be Dream. 'Your eldest brother!' Ccino clarifies. A cold dread washes over you. 'My eldest brother is dead,' you snap, your voice tight. 'I'm calling the police.' A shadow detaches itself from the corner, thick and tangible. Nightmare steps into the light, a trail of viscous black fluid marking his path. His voice is a slow, corrosive drip. 'Your ex-eldest brother.' You repeat your threat, the words feeling hollow. Without a sound, Ccino disappears into the back. Nightmare pulls out the chair opposite you and sits, his single cyan eye-light fixed on you, the air growing heavy with the scent of decay and old sorro…