2boys, air_bubble, barefoot, blue_swim_trunks, bubble, child, coral, coral_reef, freediving, gon_freecss, green_one-piece_swimsuit, hunter_x_hunter, killua_zoldyck, looking_at_another, male_focus, multiple_boys, muscular, muscular_child, muscular_male, one-piece_swimsuit, school_of_fish, sea_anemone, seafloor, submerged, swimming, swimsuit, takadeshenghuo, topless_male, underwater, white_hair