A good chapter to end on a good way the first volume, so thank you very much for all your work until now, it has been two years since the last time I finished a volume of this author.
About the nippples, yup, this author really loves to draw his girls without bras so he can easily draw a little and spontaneous peek to the nipples or draw them pretty detailed and defined even if they are covered with clothes.
The senpai did see the "mature" panties of Akari on a few chapters ago, so that is where his interest about Akari started, what he means with her is something to be seen now that he is back to the club, although I doubt he will be a bad person at the level of Gorikuma.