Rule 34 Dev - 1girl 2023 20s :3 ass bare_shoulders bare_thighs black_hair blue_eyes blush breasts collarbone competition_school_swimsuit competition_swimsuit early_teens female from_behind long_hair looking_at_viewer looking_back one-piece_swimsuit raika9 saten_ruiko school_swimsuit simple_background small_breasts smile solo standing swimsuit teenage teenage_girl thighs to_aru_kagaku_no_railgun to_aru_majutsu_no_index tokiwadai_middle_school_swimsuit twitter_username|4321922752