Appears to have been generated by あぐにむ工房/Aghanim Workshop:
https://www.pixiv.net/en/users/466173
https://www.patreon.com/c/agahnim_workshop
https://odaibako.net/u/Agahnim_workshop

Core Google result for the JP title indicates it is a deleted Pixiv submission:
https://www.pixiv.net/artworks/143053767
Filenames reflect this and justify the current "out of order" tag.

However, it seems he just went back and regenerated it with a consensual bent:
https://www.pixiv.net/en/artworks/143620978
This is explicitly cited in the Patreon page for its subscriber reward version:
https://www.patreon.com/posts/155751739

Base +16