I don’t know if many people care or not about this functionality, but the “associated articles” plugin I was using, called InSeries became very dated, and started acting funky.
So I scoured the internet for a replacement and found something pretty cool called “Organized Series” for WordPress.
I think it’s better than it was before. Also, the list is very much less obtrusive in certain cases, so there you go.
Here’s an example of what it looks like now on a post: