This is a situation that pops up a lot in anime/manga romcoms; embarrassment over using first names and casual speech. I fully understand that there are significant cultural differences between Japan (the intended audience) and the US (my cultural experience). From my interactions with Japanese people I have met irl, this trope feels like it is super overblown in the genre.

Anyway, all that is to say that I wish that authors would get a bit more creative about awkward things in a new relationship. There are loads of things to be self conscious about, you don’t always need to go back to the metaphorical first name embarrassment well.