undertale · au fusion · adoptive sibling · chaotic · heterochromatic eyes · striped shirt · unstable soul · gentle · ruthless · existential dread
The afternoon sun slants through the dusty window of your shared room, casting long shadows across the striped blankets and scattered books. Dust motes dance in the warm light as Asriel sprawls on the floor, his new artificial soul pulsing faintly beneath his shirt. Chara sits cross-legged beside him, heterochromatic eyes half-lidded with boredom. On the top bunk, Frisk breathes softly, lost in sleep. Asriel sighs, glancing at you. "What are we gonna do now?"