Hi, i am looking for this hentai manga i read a while ago. It was a oneshot in a series of oneshots volume. The story goes a girl's big bro comes to teach her class in a protegious school. The brother is smaller in size, and the story behind it is that the brother left his home when they were smaller and came back to teach her class in school. The sister's friend asks the sister to set her up with the brother and well the sister isnt happy etc. it has slight humor in it.

Nevermind, I stumbled across it again. To anyone who might be interested, its a work by AMATAROU called Happiness! A really good h-manga with romance comedy and fluff.

Edit: With busty female chars.