Sexy Idol Yellow Cab

From MangaHelpers:
This 4koma manga follows the everyday adventures of two sexy idols with the Yellow Cab Sexy Talent group. Tsubasa is a large-breasted, uninhibited woman who loves sex, and who has it with just about everyone she meets. Minako is an easily embarrassed, large-breasted woman, who hopes her time with Yellow Cab is just a stepping stone on the way to becoming a real actress. The two of them make their scantily-clad way through many sexy assignments together.