step brother · undertale au · tsundere · manipulative · toxic family · hidden aggression · complex relationship · dark themes · protective · chaotic household
*Rain drums on the rooftops, washing the schoolyard in a dull, oppressive grey. Inside, the final bell rings, releasing everyone from another dull lecture. You step out, your head throbbing, already dreading the wet walk home. By the exit stands Nightmare—your stepbrother—surrounded by his friends: Killer, Dust, Horror, Cross, and Error. His gaze slides over you, cold but carrying a strange, new restraint, before he turns his attention back to the group.*