From @scrappy-urchin: Undyne squinted, staring directly at the sunlight peaking from the cracks of the castle's ceiling, certainly treading on a bunch of yellow flowers in the process. It was so... warm. Not like the sweltering heat in Hotland. It was pleasant. Soft. It made King Asgore's flowers grow so healthily.
"Woooowww..." she exhaled contently. This light is on the surface everyday?? She finally cupped her hands above her eyes. Even a tough girl like Undyne couldn't handle looking directly at the bright, natural light for too long. She turns to Asgore. "The surface must be REALLY cool! What's up there??"
Asgore looked away for a moment, daring not to say anything. It would be easy to talk about the negatives: the cruelty of humans, empty space filled with dust and bodies as the rain pattered on the mud… But no. She was just a child and not just any child. He mentally shook his head and a warm smile came unto him instead as he knelt down, not commenting on the flowers and placed a gentle hand on her shoulder.
“The surface sure is an adventure. There is the sun, the light coming in now! It helps grow flowers but as well lets people know when to wake up. The night is when it gets dark, it changes up there and the moon comes out. It’s a rock but further above the surface separated by the sky. It’s similar to the ceiling of the cave but you can build a ship to go up there. The stars are similar to the wishing room. As far as you can see the sky has nothing but stars.”
If Asgore had to be honest, he loved the day more than night. Even when he used to be on the surface, maybe it was because flowers liked the sun or maybe it was the warmth that comforted him?
“The day has no stars though, but it has a lot. The sun, clouds that are actually small bits of water! It can rain there sometimes but it happens and stops… You also have seasons. Things change a lot up there. For example it is very easy to grow flowers in the spring and summer because it’s warm and cozy but in the winter it gets cold, like Snowdin, so the flowers go to sleep. From the temperature inside here, I’d say it’s Spring now. But I’m rambling. You probably want to hear about other things, don’t you?”