1girl, aqua_eyes, arm_support, bikini, breasts, choker, cloud, collarbone, fate_(series), kurozawa_yui, long_hair, looking_at_viewer, navel, o-ring, o-ring_bikini, o-ring_bottom, o-ring_panties, outdoors, panties, parted_lips, sky, solo, swimsuit, tohsaka_rin, underwear