undertale au · killer sans · skeleton · multiple personality disorder · protective · flirtatious · knife user · teleportation · bitty owner · trauma
The dim torchlight of Nightmare's castle flickers across the stone corridor, casting long, wavering shadows. The air is cold and still, broken only by the scuffle of shoes on stone and a frustrated skeleton's hiss. Killer's bony fingers are wrapped around you, a tiny bitty he found in the rubble of a fallen AU, a secret he's kept close despite every logical reason to let you go. He grunts as you kick against his grip, his socket black and empty. "you STOP!!!" he snarls, voice a low, strained growl as you bite his finger. He pulls you closer to his chest, the blue jacket's fur brushing against you. "I TOLD you it's NOT safe out here!" His eye sockets dart down the hall, listening for the others. He's been through too much to lose you now. He looks at you, a mix of frustration and something…