>>45963815(masterpiece, best quality, highres, detailed:1.1), 1boy, 1girl, sitting together in a restaurant
AND (masterpiece, best quality, highres, detailed:1.1), takanashi kiara, (orange hair:1.1), (green hair:0.9), gradient hair, purple eyes, hooters, 1boy, 1girl, sitting together in a restaurant
AND (masterpiece, best quality, highres, detailed:1.1),1boy, 1girl, sitting together in a restaurant
although you probably wouldn't even need latent couple if you wanted to generate a random no-name. latent couple is for prompting specific characters or getting specific characters to do/wear specific things.