1girl, ass, ass_focus, blue_eyes, blue_one-piece_swimsuit, blush, brown_hair, ceiling, fang, ichikawa_noa, indoors, long_hair, looking_at_viewer, looking_back, one-piece_swimsuit, open_mouth, photoshop_(medium), school_swimsuit, solo, sweat, swimsuit, tomodachi_no_imouto_wa_oshioki_kibou_~ai_to_jounetsu_no_oshiri_penpen~