I know people are worried about this being "rushed" but Makiba has always been very matter of fact. Once he realized he has feelings he's definitely set up to be a character that doesn't dwell on them for very long before acting.
This doesn't feel rushed or anything. But god do I hope that the series doesn't end soon. I love these characters so much. Makiba remains the GOAT. Please let us see the new sides of these two characters while in a relationship...
It startled me, but then I thought actually, this is so him. He always says what he means. Last time, he had the realization, so to him that means now he tells her.