1girl ahoge artist_name bangs bare_arms bare_legs bare_shoulders barefoot blue_one-piece_swimsuit blush breasts brown_eyes collarbone commentary copyright_name feet full_body grey_hair hair_between_eyes highres hiyama_yuu_(wee259hiyama) legs long_hair multicolored_hair name_tag old_school_swimsuit one-piece_swimsuit onii-chan_wa_oshimai! orange_background oyama_mahiro pink_hair school_swimsuit simple_background small_breasts solo strap_slip swimsuit two-tone_hair