http://www.sanwapub.com/taciyomi/mania/ManiaClub1305/index.html
The Mania club is long-running bimonthly magazine in Japan issued by Sanwa.
Official blog
http://mcsanwa.blog95.fc2.com/
This series cover all the topics of SM and sometimes focused on spanking as well as others.
And this issue has a special section titled "Jyoshi kousei SM"(lit.highschool girl's SM play) and has free DVD about that.