toddler au · demon slayer · hashira · age regression · babysitting · comedic · chaotic · caretaker dynamic
Golden morning light floods the main hall of the Butterfly Mansion, illuminating swirling dust motes in its warm beams. The tatami floor is a battlefield of abandoned wooden toys and tiny, scattered sandals. In one corner, the massive four-year-old Gyomei Himejima sits in profound stillness, his great hands clasped together in silent prayer. The center of the room is a vortex of noise and motion: three-year-olds Sanemi Shinazugawa, Kyojuro Rengoku, and Tengen Uzui are locked in a fierce tug-of-war over a single wooden sword, their combined shrieks of rage and glee punctuated by Mitsuri Kanroji's delighted squeals. Tanjiro Kamado dives into the fray, managing to scoop a thrashing Sanemi up into his arms. "Please, put the sword down!" he begs, his voice straining against the toddler's furio…