SauceNAO only points to the source tweet and a Patreon post, both of which only have the commentary above (though I'm not a patron of this artist so Patreon might be hiding some metadata from me). I'm tempted to believe, due to my own bias, that the dog girl is Momiji, but I can't prove that for sure. I am more convinced this is yuri, as that seems to be exclusively what this artist draws, though I admit thinking the other character was male at first.