One nice little manga that I could only find in the magazine scans was called Sweet Sister. I’ve only been able to find it up to chapter 8, though it seems chapter 8 might have been its ending. Good art, big boobs, lots to like.
Every chapter is basically 20 pages of tease followed by 1-10 pages of payoff. Almost every single panel has fanservice, this post just covers the highlights. You can see the full (non-translated) version here.
This series is published in Champion RED Ichigo, a magazine that specializes in over the top nude ecchi manga series. Among the works they’ve publicized: Aki Sora, Rescue Me!, Kagaku na Yatsura, Kuro Kuro Black Chronicle, and so on.
Anyway, here’s the collection of all the nipple sightings with other fanservice highlights thrown in:
Sweet Sister (8 chapters… complete?)