Here we have Kozue no Sora, an unanimated episode of Yosuga no Sora that didn't make the cut.
English translation coming soon.
Lynx's comment: Uh... I don't know if this goes under Artist CG or Doujinshi, but yeah. Kozue no Sora scans! We're also looking for the missing pdf files that the group released after the printing of this doujinshi, that people could email the group for. They no longer answer emails, so we're hoping someone else has them.
EDIT to Lynx's comment: We've now found the two missing pages!