This is an old nsfw comic made by Caterina featuring her characters, Ricard and Hege, from her webcomic Bond by Fire. This was originally posted on her Tumblr in February 2017 but that unfortunately is gone due to the 2018 purge and I got this from a Twitter thread where she posted the whole thing. Recommend her work if you're into monsterfucker and other weird stuff. It's pretty good.

You can support her webcomic here:
https://m.webtoons.com/en/canvas/bond-by-fire/list?title_no=735187

SFW Twitter:
https://twitter.com/RatCate

Edit: It have come to my attention she have locked her NSFW Twitter account for her mental well being and her Gumroad (along with many others due to credit card companies being assholes lately about NSFW content) is deleted. I decided to erase the links to her Gumroad/NSFW account. I wish her the best of luck and thank you for your great work