Ah I remember this one
Definitely gives off "there was supposed to be another volume or two" vibes. Rereading it feels a little weird, I thought I remembered there being more build up between Haru and Fuyu, but instead it seemed like we got hints of Fuyu's feelings in Chapter 1, and then Haru has the dream in Chapter 15, and then they get together in 17. There's the little bit with them being awkward about the hug earlier, and Fuyu makes some possessive comments about Haru, but like... That's it. Honestly, it seemed like Nanaya and Minori got more development.
Still, it is very cute, and Chapter 17 is incredibly well done as a confession and first kiss.