I've loved this manga thus far, but this whole arc was a mistake.
This joke of a uni professor? She's the embodiment of cringe. It's like the author asked a preschooler to describe a “cool professor”.
The setting for this arc is annoyingly bad. This little pest from the school, Shinjou Keisuke, is trying to get together with Saki. Then a sociopathic cringelord of a uni professor appears, gets absurdly interested in her, starts playing a psychologist for her, and tells her to basically try to find someone else. It almost couldn't be more obvious what the author is going for, and it's cheap as hell. The NTR arc as a trigger for the main couple's progress is such a bad cliché.
Again, I've loved this manga, but this arc alone might make me drop this.