>>125241
saucenao.com confirms my suspicion that it's 774/nanashi's work - but it has been scrubbed from pixiv.

Not even the most complete exhentai archived gallery has that image

https://exhentai.org/g/131696/1769af9e4f

(for those that don't know, you have to have an e-hentai account that you log in to BEFORE you access any exhentai page, or you will get the sad panda)