Please do support the creator if you like such content.
Sources:
Fanbox: https://bobcaters.fanbox.cc/
Dlsite: https://www.dlsite.com/maniax/work/=/product_id/RJ01558150.html

Support the creator so that he can continue to draw|

The image source this time is unfortunately a bit different. They are all screenshots from the DLSite play's streaming because DLSite doesn't even allow the buyer to download the product.

If I scan the doujin with my printer, it will be at higher resolution. However, the book's spine will usually cause a block of shadow to cast over the pages more prominently if the doujin is thick.