Whew! Took me so long! I didn't even bother to use FireAlpaca, though. Sigh . . . would've been so much better, really. Backstory: Ever since Shade broke her heart, Frostbite has been having strange dreams. Then one day, when Shade tries apologizing, she morphs into a winged cat with practically entirely opposite colors of her. This is Sparkbite, her . . . persay, "flipside", although in my opinion - SHUSH. I'm listening to the story. Okay, okay . . . Shade almost dies that day, but narrowly escapes. When she morphs back, she begins to cry, and does so for several days. And after that . . . every time she is angered, she becomes Sparkbite, and will either seriously injure or kill whoever has maddened her.
Credit to @Kally97