This has got to be the most annoying chapter of the series so far, but also the one that also feels most satisfying.
Annoying because the mangaka just had to use worn-out clichés of Kuzumi staring at Nee-san's boobs; the idiot duo attempting to hide something from the FMC; someone else meddling in a relationship; and particularly annoying because the most annoying MC of any series doesn't have the balls himself, but has to be forced to take action and yet still does not have the courtesy (or balls) to apologize to Erika for being such a dirt-bag or to tell her how he feels (if he actually feels anything).
The most satisfying because Erika is happy with her relationship (or lack thereof) with Kuzumi going back to the way it was and that Kuzumi was dumbfounded that whatever message he was silently trying to say didn't get across. Open your mouth and say something you ahole! I know it won't happen, but now would be a good time for Erika to find herself a real boyfriend, someone who would appreciate her for who she is, and not a boyfriend who's like a piece of water-logged driftwood.