Fukushuu Kyoushi: Onna-domo, Motto Aege!

In a classroom after school had finished... A girl lies tied up after having an aphrodisiac gel rubbed on her... The sweet torture of coming over and over again! But it won't stop! And the horrible culprit of this attack, is this school's most popular teacher!

(Source: Coolmic)

Note: Released in 16 episodes in long-strip format, and subsequently sold as 7 chapters in traditional format.