TJ's route was the only route that completely shattered me the first time, though maybe it's because I have a thing for TJ ¯\_(ツ)_/¯. It might hit even harder if you've played Flynn's before, so you're in for a treat!
Fair warning, don't expect the game to get any better, I had to take a water break because the TJ's ending was getting too much for me. Also, you might come to hate a certain character afterwards...
Happy reading!