Drizzle is going to go through some rough times now that Lichenkit is gone. She is convinced she is an awful cat for being such a bad sister and doesn't deserve to be happy. I used to imagine this image as Drizzle just being grouchy near Lichen but my new interpretation is that she is thinking about Lichenkit after she had passed away. Her last few words to Lichen were "I still think it's for the best that we stop spending time together." "Okay. As long as you promise you'll be okay." and after that "I promise". Side note: If Drizzle ever gets around to having kits one of them will definitely be named after Lichenkit.
Art by me