Nodoka doesn't address Sakuta with honorifics and i find that very wholesome
On top of all the things that demonstrate how much Nodoka grew to trust Sakuta later in the series, such as her seeking HIM out for counseling when Zukki develops puberty syndrome, the mere fact that she just casually calls him "Sakuta" is something that warms my heart. Basically everyone else calls him either "Asuzagawa" or "Sakuta + suffix" (Sakuta Sensei, etc), except Mai herself, but that's to be expected for obvious reasons. Nodoka calling Sakuta by just his name demonstrates how much she trusts him and is able to feel relaxed around him. She really grew to appreciate and respect the guy as a full-fledged family member throughout the series. The best part about it is just how EARNED it feels, especially if you compare it to how she perceived and treated Sakuta all the way back during her own arc, and also when you take into account everything that they went through together AND saw each other go through on their own. Nodoka wouldn't hesitate to stand up for her brother-in-law in any situation.
Unironically one of my favorite character relationships in the series.