Haa Haa manga is a popular manga covering Comedy, Josei, Romance, Smut genres. Written by the Yoshihara Yuki. 13 chapters have been translated and translations of other chapters are in progress.
From ShoujoMagic:As the substitute for a teacher on temporary absence, Shibata Seiko is now the teacher of an all-boys' school. As she just made up her mind to be a fantastic teacher, a man has come into her life and took her as his 'sex toy'?! And the man is actually a teacher from Seiko's school!?
LATEST CHAPTER : Vol.3 chapter 13 : Let s Both Go HAA HAA
Vol.1 chapter 1 : The Teacher s Office Is Paradise on Earth
Vol.1 chapter 2 : Let s Meet after School
Vol.1 Chapter 3 : A Drenched Out-Of-Class Activity
Vol.2 Chapter 4 : Must Be Love
Vol.2 Chapter 5 : A Blooming Flower Is The Prettiest Of All
Vol.2 Chapter 6 : Love Letter
Vol.2 Chapter 7 : A Sky Filled With Stars
Vol.2 Chapter 8 : Yesterday Today Tomorrow
Vol.3 chapter 9 : Love s Distance
Vol.3 Chapter 10 : One Million Dollars Lady
Vol.3 Chapter 11 : Stranger In The Night
Vol.3 Chapter 12 : Love Nest
Vol.3 chapter 13 : Let s Both Go HAA HAA