Seeking More Canon Content of Yukino and Hachiman's Relationship

I just finished watching Season 3 of the anime along with the OVA. I found the OVA quite strange, especially the parts where Yui, Iroha, and Hachiman's sister plan to disrupt the relationship between Yukino and Hachiman. I was rooting for Yukino because I found her to be a deeply interesting character with a lot of depth. The chemistry between Hachiman and Yukino is excellent, and I really enjoyed seeing their connection grow.

What I’d like to know is whether there’s more content featuring Yukino and Hachiman as a couple. Has the author published anything about their third year or perhaps their future together? I’ve heard about Shin and Ketsu, but I’m not sure if they’re canon or if they delve deeper into Yukino and Hachiman’s relationship. Since I’m new to this, I’d appreciate any guidance!