The Chinese artist Jing Hu made a Nonon x Satsuki comic, if anyone's interested. Unfortunately, there isn't much of a preview for it other than the cover page.
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=41330723
http://killsheep.blog128.fc2.com/blog-entry-91.html

Muuuch better than the sister incest. Nonon deserves some love from thick-eyebrows-chan.