Rule 34 Dev - 10s 1girl 2012 alternate_costume ass back bare_back bare_shoulders big_ass bikini blush brown_eyes brown_hair butt_crack cloud day dimples_of_venus early_teens female frilled_bikini frills from_behind hair_ornament hairclip highres looking_at_viewer looking_back mameshiba matching_hair/eyes misaka_mikoto official_alternate_costume outdoors polka_dot polka_dot_bikini polka_dot_swimsuit rock shiny shiny_skin short_hair shoulder_blades sky solo standing swimsuit teenage teenage_girl thighs to_aru_kagaku_no_railgun to_aru_majutsu_no_index|4274140363