She hadn't told Erebos about her artwork from the previous night. Not that she was deliberately keeping anything from him; Nyx did not do that to her husband, and even had she wanted to, there was no point. Darkness found out everything eventually anyway. Sometimes before she wished he would. It was ridiculously difficult to hide his birthday presents. If they were in the open, they were far too easy to spot, but the moment she hid them away they were in his shadows where he'd know about them immediately. Difficult man, she thought fondly.
Besides, she didn't even know if anybody had seen her message yet. It would be ever so much more fun if she could return to her husband with a story. Perhaps some mortal had found it, and would wonder at the size and wit of the sandy sketches. Maybe it reaffirmed their faith in the gods, that would be a feel-good tale to share. But mostly Nyx was hoping a sun god had seen it. That would make the best story of all.
So Nyx slipped away from Erebos in their dance across the sky to check in on her handiwork. And she was not disappointed. For her message had been erased and another left in its place. It was just as large as hers had been and there was the slightest of glows to the lines so she knew it was the work of a divine being. And given the content, it was obvious a person of the solar persuasion had been the author.
She was slinking away, was she? Beaten back by the glorious sunlight that everyone wanted to play in? Fair enough given that she had the sun setting a cow on fire, she supposed. Nyx considered, briefly, leaving a notation of all of the fun things that could be done in the dark of the night, but that might give the wrong impression. Some of those things were wonderfully naughty with the right person, but the only right person for Nyx was Erebos. Maybe she'd draw those pictures for her husband later.
Down in the corner, smaller than the other pictures, was a confusing drawing that caught Nyx's attention. It looked like a bird, maybe a falcon, with a circle on its head, holding a little stickman doll. And followed by a boob. She could not figure out what else a circle with a dot in the middle was supposed to be other than a breast and a nipple, since the circle on the bird's head was obviously the sun. Suns did not have nipples. How odd. What did it mean?
Now this was something fun to tell her husband! But first she needed to leave a response. It would be rude not to, since the sun had taken such pains to reply to her. Using her wings, she reluctantly brushed away the day's drawing and prepared to leave one from the night.
Nyx thought for a few minutes, her mind repeatedly going back to the booby bird, and then she began to smile. She'd need something special for this endeavor, something that couldn't be found in Egypt. A heartbeat later she was watching waves crash into a volcanic shoreline. Nyx worked quickly, gathering what she needed before the local goddess could show off her fiery temper in an explosion of lava and hot gas. In a very short time, she'd left the tropical island behind and was back in the desert.