We continue to have frequent visits by this larger male cat that looks very much like Nacho. They have these meow exchanges that sound a lot like they're sighing. Him in his low pitched tone, and her in her high pitched one. The cat often meets us at our front door as if to say, "Can you send Nacho outside?" We open the door, and they look at each other and meow, but he never crosses the threshold to come inside, and she never goes outside. You can see her face peaking out here in the picture.