If its out of nowhere then I would go like WTF and feel out of place, and frankly I don't see how the pairing can be majorly developed right now because well the focus of the story isn't on romance
I would not but a part of the fandom would accuse Isayama of queerbaiting as well because of Yumikuri
That's how I'm feeling right now too tbh, I know people are getting hyped about it, but it's not like this a shoujo series no ofcourse not this is a shounen romance will definitely be the last thing on Isayama's part because it's not the main focus of the series. It's The Titans that's the whole focus of the series and that's what should be and is the most important part.
I'd defintely have to agree when it comes to part of the fandom that do care about pairings for accusing Isayama. Romance should only be minuscule at best when it comes to a series like this, and I mean as long the pairings are "properly developed" then it won't be that big of a deal.
Getting off the topic of romance and pairings since another series we know kinda ugh.. you know, but I do find it interesting how much development Historia has gotten over the course of the series. Some of my friends actually found her pretty annoying in the beginning of the series because they considered her "The Hinata" of AoT. Funny thing is they're only watching the anime and are kinda stubborn to read the manga for some reason, and I'm gonna find it hillarious to see what their reaction when they see just what Historia has to offer in the second season because I'm pretty sure that's going to be a shocker for sure especially when it comes to the whole big mystery behind what happened to Eren's Father.