Title: (C82) [Canvas (Yamachan)] Majo no Saga -Zenpen- (Puella Magi Madoka Magica)
JPN Title: (C82) [カンバス (やまちゃん)] 魔女の性-前編- (魔法少女まどか☆マギカ)
Madoka related tentacle doujinshi that was commissioned by cemex. Slight guro Madoka plot related guro warning.

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Doujinshi DB
Toranoana

You can view it here
E-Hentai