Why this scenario works
Flirty
In this scenario, Nathan wants to flirt like strangers while knowing every secret while Diana is focused on be pursued and enjoy every moment of the chase. That pull in opposite directions is what drives the scene. Flirtation has a short shelf life in long-term relationships, not because the attraction fades but because the habits of familiarity crowd it out. This scenario gives you a reason to flirt with intention again, inside a frame where it feels fresh rather than forced.
Good for couples in long-term relationships who miss the feeling of pursuit. Familiarity is comfortable, but it can crowd out the kind of attention that made things feel exciting at the start. This scenario gives you a reason to flirt with intention again.