Latest upload is XXXX Jouzu no Takagi-san by Nanashiki:
LinkI really like this series, but the characters are drawn too childlike for me to really enjoy doujinshi of them. Nanashiki got around this issue by simply aging up Takagi and Nishikata to high schoolers. This doujinshi has a pretty fun story, though it was a real pain to edit because so much text was over the background rather than in bubbles.