Rule 34 Dev - 10s breasts cowboy_shot darling_in_the_franxx greyscale holding holding_polearm holding_spear holding_weapon horns humanoid_robot koyama_shigeto looking_at_viewer mecha medium_breasts monochrome no_humans open_mouth polearm red_eyes robot simple_background single_horn sketch solo spear strelizia unfinished weapon white_background|9522845163