Bella's not sure where she has wandered. She thought she was about to walk into a shop, but this appears to be an unattended bar. With none of the windows associated with the shop she thought she was entering. It could be an elaborate psychic assault of some kind, but it doesn't feel very... assault-y... and she was in the middle of a town and doesn't think any humans want to sic their 'mon on her. It's strange. She approaches the bar, looking around warily, hand hovering near her belt.
"Okay, the reason you are pulled down towards the planet instead of floating away, and in fact the reason why planets are spherical, is a force called gravity. Black holes have so much stuff in such a small place that they have stupidly large amounts of gravity and they squish anything they catch. Even light."
"I wonder if that means they're very bright inside."
"I... don't think it means that, but I couldn't tell you from personal experience, if I fell into my black hole I couldn't get to the inside of it, I can't squish so it's just like a solid dense thing which happens to be extremely gravitational."
"I could try dark scrying it. Then I'd know."
"Sure, go for it. It's under my house."
"That's weird. I can find the inside of Milliways from here, which I guess is useful because it means I don't have to keep going in and out of the door, but I can't find any of the parts of your world."
"Well, you can check it out some other time, then, I suppose it shouldn't surprise me that you can't get all the way to my world with your magic."
"Do you think she read the note yet? Should I check?"
"Go ahead and check."
Well, she seems to be looking at the note, but only intermittently. She has set her book aside and is peering around the room from her bed.
"She's looking at the note and then around and then at the note again," says Shadow. "Should we go there?"
And now they are there. Still invisible.
"Hey you. Come up with a usable nickname yet?"
"Uh. Nothing good. Call me Twist for now. Uh, you're invisible?"
"Twist it is. We are invisible, but we can stop that if you wanna come hang out someplace less hazardous for me and this Shadow here."
"Yyyyeah sure I want to hear the rest of the story." She holds out her hand.
They emerge inside of Milliways, next to where Earth is holding the door and Shine and Dust and Kisonde and Promise are standing around.
Dust looks at them. "That's interesting," she says, and Shadow and Revelation fade into visibility.
"...hi, guys, what's going on?"
"Aren't you glad they like you?"
"To what?" asks Shadow.
"To much of anything."
"Well, I recognize you, but I don't think I ever worked with you. I'm enrolled in the school that. I'm going to say 'owned' past tense. You. And him and her." She points at Earth and Shine.
"Hi. Wow, you do look just like me, don't you, only taller and no wings. What are we calling you?"