She way too carefree with telling people he's her boyfriend.
I mean, she wasn't before. It is only now that his father has approved of her that she's becoming more carefree about it. Or maybe it was subconsciously trying keep them away from her boyfriend? 🤔
Also, I shared Eruko's sudden panic attack at hearing Hoshi say "Mom?" just as she left the bath. Like, Jesus Christ suddenly hearing the person you've been bragging about is the mother of your barely legal partner is a very scary thought, even if she was so open about not being against it.
Now...that is a very unfortunate moment to reveal she's "Shingeki no Eroko", specially when she hadn't said it to Hoshi before. It might feel like she wanted to keep it a secret from him and only by putting pressure into her she revealed it, which might play into some of his insecurities enough that they split for a bit at this point (mostly going off the implication at the start of the chapter, where he expected her to tell him at some moment), but with the mom there I have to wonder how much that kind of situation would be allowed. Don't think she'd leave them to be all awkward and weird around each other so easily.
Lastly, take care Ron! Hopefully you recover well enough you can enjoy the festivities, and take your time!