What was Kris thinking here?
Did they just play with Noelle a little bit to "be polite" and then move on when they hit the arbitrary "politeness quota"?
Or did they really have so much fun playing with Noelle and enjoying her company that they forgot why they came over in the first place? If so, why stop all of a sudden? Was playing piano that important?

I don't know if Noelle is in love with Kris, but she yearns for Kris. I think about her private blogpost from the Spamton Sweepstakes a lot. She's writing poetry about missing Kris, wanting to hear their music again.

https://deltarune.com/kris_dreemurr_kris/