I'm very confident in recommending "The Black-bellied Demonic Concubine Is Naughty" to you. This novel is a fantasy romance novel. The female protagonist inexplicably transmigrated into a baby and raised her younger brother as a pet since he was young. This younger brother became absolutely black-bellied during the process of being raised by the female protagonist and was very loyal to the female protagonist. The plot of this novel is compact, full of joy and tears, and the pets are very cute! I hope you like this fairy's recommendation. Muah ~😗