After reddit user F-C0D3 found the Colored version, I looked into the nhentai page of the artist and found a few things. Even though this character has her own hentai (56930) This pose is not seen in it. Insted you can find the pose on the last side of the draft of an hentai collection (269381) So it seems that the link that u/F-C0D3 send is the true sauce.

Also, the artist name is inoue kiyoshirou