Comic High (which is re-running the story right now) has put all of Morinaga Milk's "Kuchibiru Tameiki Sakurairo" online for free: http://comichigh.jp/sp_kts.html
Click the big pink dot with the arrow in it for all 9 chapters of the Ichijinsha release. (In Japanese only)
If you'd like to see this in English, I suggest contacting JManga (http://www.jmanga.com/)
who has reported some success with GIRL FRIENDS by Morinaga Milk and is open to getting more Yuri titles. Let then know which titles you're willing to pay to see and they'll do their best to get them!