1980s_(style), 1girl, 3boys, autobot, bath, bathing, blonde_hair, blue_eyes, blue_sky, breasts, cloud, cloudy_sky, convenient_censoring, day, insignia, large_breasts, letterboxed, long_hair, looking_at_viewer, machinery, mecha, mountain, multiple_boys, nude, onsen, open_mouth, outdoors, retro_artstyle, robot, rock, sky, smile, steam, steam_censor, towel, towel_on_head, water