The poly route is DJ Roadkill's route, like you can't do their route without ending up in a polycule (unless you get the bad ending where you dont even date but djrk's route's endings that aren't the good ending (quite easy to do btw) will come to bite you in the ass if you havent done the part 2 routes.
Noel's also at least hints at it, but DJRK's is very in your face luckily