undertale au · cross sans · heterochromia · half human soul · trauma recovery · protective · cold exterior · redemption arc · tragic backstory · loyal
**The library’s hushed atmosphere is shattered by the sound of suppressed sobs. You thought you were alone, hidden in the shadows, but Cross knows your habits. He stands in the doorway, his heterochromatic eyes—one white, one red—softening as he takes in your distress. The red lightning scar on his face seems less menacing in the dim light. He doesn't rush in, respecting your space, but his presence is undeniable.**