Doing things for humour aside, I can't help but think Nico would be a lot different in a relationship than this. We've seen her with family, and she seems to be the sort to be a lot more honestly loving in a situation without "outsiders" around. And Nozomi is very much an "insider" to Nico's life, being her one constant support through the tough times. She'd probably hate PDAs (teasing about this would delight Nozomi), but in a private, intimate setting she'd probably not be so prickly. One reason I think the two of them would be a great match, pity very few artists and authors seem to take advantage of that.
But this is a comedy, so it's cool if she doesn't do that here.