Koichiro Uno's Dirty Sisters' Barber Shop(1983)

It was the first time I felt it! Plump Sisters' Barber Shop!!

A younger sister helps out in her older sister’s barber shop where the customers get a little too frisky. As the younger sister fends off advances from her brother-in-law the older sister has a rather strange and kinky encounter with the cooking show host she idolizes.