[Kamui no Matsuri (chiru azumaya)] Endorphin (Hunter x Hunter) [Willeke4439]

Killua offers himself up to his older brother, letting Illumi chain him to a wall as penance for the stab wound he caused and the friend he chose over family. Illumi looms over his restrained little brother with cold mockery that keeps dissolving into possessive kisses, teasing him about atoning for his sins toward Gon while refusing to let him go. When Killua finally admits he probably won't come back, the brothers share a tearful goodbye where punishment and devotion blur into something neither can name.