Artist: Ogawa Masahi
Title: Candy Girls
Contains: Breast Reduction, LOTS of Lactation, Huge Breasted Women, etc
Source: I think it was masterbloodfer's forum...I forgot to post this so I can't remember.
Anyway, the premise of the first scene of the manga is that a teacher's breasts are overladen with milk causing her to lactate, and a student just happens to witness said problem and volunteers to "help her". At the end of all the milking and sex, her breast are back to normal.
Cover:
Complete Manga:
Megaupload Link
Previews attached below