I was browsing through scanlations of manga and saw this, I tried to find the right ISBN but unfortunately I have to settle for this one, not sure if it is the right one, the title and author is right though.

Anyways this became my "guilty pleasure" read over the weekend, in manga and in anime, those absurd/silly way of being "funny" in facial expressions especially the "perverted" or "ashamed" expressions are one of a kind and it create giggles or maybe a fit of laughter from the reader. The story have a heavy theme if the reader is not tolerant of erotic stories, S&M/Bondage is everywhere with the main two characters, and it explores the psyche of why people are "turned on" with it, esp with the subject are HS students.

With many themes/subjects/variety of stories in the Japanese manga world, it is nice to get ideas from it. What I've read are scanlations and the grammar are sometimes off, so I hope there is a legit translation out there.