"If there are ever more people around - all the time, not just here - how much do you need to do this...?"
"I don't know," she says. "Do you mean how much of it do I need to do? I definitely don't know that. Or how strongly do I feel about doing it? I'm not sure I know that either. I know how I feel about never ever doing it again, though, and it's really really bad."
"I'm sorry," murmurs Etty. "I just - I don't want anybody but you, and I don't - understand."
"I don't understand either," says Nona. "I don't understand why it's such a thing the way it is."
Bella will Not Be A Sex Therapist some other day, apparently. "She doesn't want anybody but you. For a monogamous person that's connected with - depth of feeling, commitment. If Etty heard a reliable prophecy about the future that said she slept with somebody who wasn't you, she'd assume this meant that in the prophesied future, you'd broken up or that she didn't like you much anymore or something was unsatisfactory about the relationship - correct me if I'm wrong, Etty."
"Oh," says Nona. "That's not - no. At all. No. How much I love you doesn't have anything to do with how I feel about anybody else."
"Celo suggests that I could read Nona and then try to explain you to each other," says Bella.
She shrugs. "There's some stuff you might not like, but I don't think there's anything I'd be upset about you knowing."
Nona is mostly wondering what she should be thinking about. How do you explain something when you don't understand the thing it's supposed to be different from? Loving Etty and having sex with Celo don't have anything more to do with each other than loving Etty and masturbating do. Slightly less, actually.