Found a link to the Shikigami Ran sequence from last weeks 2chan thread with even more detail. Obvious tribute to the Magic/Evil City Astaroth conversion from Cream Lemon which could always use some more tributing...
http://www.pixiv.net/member_illust.p...ust_id=7128888
Monster transformation that includes tentacles rape, injection, multibreast, and genital tongue? Viewer discretion advised at viewers' discretion.
Tip for pixiv hunters. Pixiv tags seem to often fall short of search redancy. 悪堕ち generally gets the bulk of the EC stuff, but some subcatorgories like the Evil Touhou meme 東方悪堕ち doesn't always tag 悪堕ち and 東方悪堕ち and simply leave it at the later making those sets miss the general EC search.