Nina R. Schluntz

Demon Tiamat is sent to yet another world. If he can save it from having an apocalyptic event, then the gods who create worlds will send him back to his home world-Earth. If done correctly, other planets will also be saved. One from a bitter vampire who committed genocide against his own kind, upsetting the balance of his world and ending all life on it. Another world saved from a psychopathic serial killer who could learn to stop his self-destructive ways and unite with his former lover.
But this world is strange. Its integrated with an artificial intelligence that makes everything seem like a simulated game in a fantasy adventure. Tiamat is cast as an adorable cat, known as a Chimera, not his normal intimating six headed dragon. He has to find allies, figure out who is plotting to destroy this world, and navigate the possibility that demon kind's natural enemy, these planet creating gods, well, one of them might be in love with him.
Could it be his own happy ending isn't a return to earth's hell, but rather rising to be a creator of worlds with his nemesis, Norman, who usually just shows up to stock the snacks. Cross-over event: Includes HEA for characters from Fated Mate for a Vampire, Gods of Earth, Mates & Mages, and Kidnapped Killer.* Novel exists as a standalone though it has crossover characters from several other book series.