1girl, ass, blue_one-piece_swimsuit, breasts, cowboy_shot, facing_away, fate/kaleid_liner_prisma_illya, fate_(series), from_behind, illyasviel_von_einzbern, ladder, loli, long_hair, natopo_uni, one-piece_swimsuit, pool, pool_ladder, poolside, school_swimsuit, simple_background, small_breasts, solo, standing, straight_hair, swimsuit, thigh_gap, thighs, wading, water, wet, wet_clothes, wet_swimsuit, white_background, white_hair