One morning they wake up together and are lying there in comfortable silence when Etty scoots up and kisses Nona.
Kisses.
She should probably tell Nona about the - "Um, I like kissing you," Etty murmurs, "but - don't surprise me? Till I say different?"
Kisses are, in general, a pleasant addition to snuggles. Nona is pleased about them. As requested, she offers no surprises... about that.
A few weeks after the onset of kisses, Nona yells from her bedroom, "Etty I found a thing! Come see!"
"I found a place!" says Nona triumphantly.
Etty is rather taken aback by the strangeness of the door. And the nudity. "Have you been casting peculiar spells?" she asks.
"Nooo," she giggles. "This place just does that. It's called Milliways and it has a door that goes to all different places and today it came here. And there's somebody I want you to meet!" She sticks her head through the door. "Celo? Celo, where'd you run off to?"
"Celo's a nymph," Nona explains. "He's from a different world. They have a lot more magic there, and all kinds of horrible things but some that sound pretty nice, and nymphs are a kind of person that comes out of a field of plants and has to have sex with men a lot or they'll die. But Celo says me and him are a lot like each other, and I think he's right. I think he's that other world's version of me."
"...Oh. That's... really interesting actually," says Etty. "...What else do you have in common, is he - okay?"
"He's... more okay than me," says Nona. "He's been away from his - it wasn't his father, he doesn't have one, but his - person like that - for way longer. But he had a lot of the same not-okay stuff happen."
"There's some kind of thing happening," Nona says vaguely. "Celo said it'd been going on for a few hours already when he got here, and that was a few hours ago. He likes it because it means he blends in more; he can't wear clothes because his mother's a goddess and she said nymphs aren't allowed."
"...There's more of me?" Etty steps inside, tucking herself under Nona's arm. "Yes, please - I'd like to meet - her? Is it a her?"