Since we're doing lore discussion, what do we think about the prophecy? Particularly this bit to keep it yuri focused.

Susie gets very excited about this panel and asks Ralsei what the prophecy says about Noelle afterwards, so it's possible she thinks its confirmation of Noelle being in love with her.

As for what it might actually mean for the game's story, Gerson talks a lot in this chapter about reinterpretation and reading between the lines.

There's been a lot of theorizing that Susie isn't actually the second hero of the prophecy due to the somewhat odd picture (Susie won't equip swords for one thing), and that a different panel says "And last was the girl" with a picture of what is definitely Susie's Rude Buster attack, though I'm not sure about this since there's another panel that depicts all three heroes and that one definitely looks like Susie.

There's the obvious love and LOVE dichotomy from Undertale, and the Japanese translation of this panel is "the girl finds out the true meaning of love." The heart also appears to be the human soul.

My guess is that it's foreshadowing some climactic moment where Kris gives their soul to Susie, and the sword looks like Kris's sword, too. On the Weird Route we've already seemingly forced some of the soul inside Noelle, and she can equip certain swords, so it works for both routes.

I'm really hoping I'm wrong though, I want Noelle to have a more active role in the story instead of constantly being overshadowed by the other main characters or relegated to the Weird Route.

I'd love it if Noelle and Susie could save the world with the power of yuri and videogame glitches together, but I'm having difficulty seeing it with the info we have.