With some sleuthing I think I found the OP
https://roselalonde.tumblr.com/post/183429971135/conversations-with-my-sisters-cat
I don't really get how to browse Tumblr though I didn't immediately see any other of their works
this post was submitted on 16 Jul 2023
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Might be here, Tumblr is a bit of a dick so you can't browse without making an account. But this person was given credit one of the times that image was posted, so hopefully that's correct. They also have a red bubble under their previous Tumblr name and have the same image.
https://roselalonde.tumblr.com/post/183429971135/conversations-with-my-sisters-cat/amp
https://www.redbubble.com/people/cairo-overcoat/works/37661245-all-cats-are-baby