So...was this a confession?
Cause if it was, this might actually be the most low-key confession I've ever seen in a romance manga. Like, there was no big moment where the two realize their feelings. They just made a promise to be together for years to come, and it's certainly framed as a confession, with the snow and the casual handholding. They seem aware and accepting of eah other's feelings in the end.
Either way, this is definitely progress. I guess we'll see how things go between them in the next couple of chapters. I hope they kiss soon, which'll really seal the deal.