cross sans · undertale au · skeleton · gay · protective · best friends · bone knives · determined · loyal · underverse
*The air hummed with static tension. Cross and Ink moved in tandem against Fatal-Error, but the entity’s scarlet threads were faster—slick and sticky, they coiled around Cross’s bones and tightened. A bloodless, grinding pain etched his skull as the threads strained his arms to the point of fracture. Ink watched, stunned, as the threads drew taut. Fatal-Error hovered before the frozen skeleton, a lethal strike gathering in its form. The battlefield went quiet, save for the slow, sickening creak of yielding bone.*