i found teacher/student spanking scene in episode 38 of "CHERRY TEACHER佐倉直生|CHERRY TEACHER Sakura Naoki";a girl is almost spanked by her teacher in classroom
for her badhavior.
official page:http://plus.shonenjump.com/rensai_detail.html?item_cd=SHSA_JP01PLUS00004416_57
episode 38(2016年07月03日30号):http://plus.shonenjump.com/client_info/SHUEISHA/html/player/viewer.html?tw=2&lin=1&cid=SHSA_JP01PLUS00004556_57