1boy, arms_up, ass, black_hair, blue_eyes, blue_hair, blue_sky, cloud, crossdressing, from_behind, holding, holding_hair, kimetsu_no_yaiba, kingbawoon, long_hair, male_focus, one-piece_swimsuit, otoko_no_ko, outdoors, pool, school_swimsuit, sky, solo, swimsuit, tokitou_muichirou, water