2boys, abs, ball, beachball, biceps, full_body, glasses, grin, hand_in_pocket, hand_on_another's_shoulder, holding, holding_innertube, innertube, kim_dokja, looking_at_viewer, male_focus, multiple_boys, muscular, muscular_male, omniscient_reader's_viewpoint, onlyraii, shirt, short_hair, shorts, simple_background, slippers, smile, whistle, whistle_around_neck, yoo_joonghyuk