They did foreshadow it though. In the wedding phase of the story, and before that with how the only persons she seems to allow to touch her are Tia and Zeno.
Forshadowing should be done repeatedly through the story not just a single mention one chapter ago.
People don't like my comment how I dislike this forced shipping because they like the characters. I get it. To be frank, in retrospect, I dislike a lot of my own comments I wrote in this comment section too. They sound stupid even when i read them now and I definitely should have rephrased and rewritten some of them.
However I stand my ground about the relationship of Kuro +Butler. When the whole story was about Beatrice +prince, inserting this second ship while there were no romantical signs between the characters until the last 2 chapters or so, feels forced and out of place. I don't even consider touching in that context as being romantical. More a sign if friendship.
But hey thats just me. Im just saying that the majority of manga I've read have set up romances of side characters more competently and we should be allowed to expect more.