Tbf, i prefer When?! as their scans have better quality and the text flows more naturally.
Reiji's confession, even if it's not the best moment on a meta sense (trapped on Yuri's domains, with her very possibly overhearing because Nagi raised her voice a bit on a panel is like Reiji is deliberately wanting Yuri to chimp out) may be what Nagi needed at this very moment. It also serves as a counterposition to Esemori's rejection of Yuko and a parallelism to Yuko's last attempt at climbing back from the abyss (Ch. 164) before being pushed back into it by Akira.
Let's see what happens after the flashback.