Transmigrated as the Villain's Child Bride

Complete Blurb 1: Other people who transmigrate get the role of a tragic supporting heroine, but she gets the laid-back protagonist's halo. Her first ten years go smoothly, with everything falling into place. Then a young man appears and completely upends her life! It turns out her true identity is the sole wife of the great villain?! The young man has red lips and pearly white teeth, and looks no older than fourteen or fifteen. He's tall and well-built... but the icy aura around him is terrifying. She's scared. At their first meeting, he says, "I want to have a baby with you." "???" You can't joke about something like that! Blurb 2: Fang Mengchu in everyone else's eyes: unpredictable, desireless and merciless as the King of Hell claiming a life whenever she makes a move. At a young age, she's already terrified all the great clans, a peerless genius truly blessed by heaven! Fang Mengchu in Sifeng's eyes: an old vinegar jar, always fighting her for the blankets, clinging to her every day to play, constantly sulking, and always wanting her to coax him. He's also incredibly possessive! To change the way the world sees him, Sifeng works every day to spread stories about his misdeeds, embellishing them as he goes. For example, he can't fall asleep without a kiss every night, likes to lounge in bed in the morning, and needs to be gently woken up. When Fang Mengchu hears these rumors from others, she smiles faintly. "So that's what she wants to do. Looks like I'll have to make the rumors come true." After that, the rumor-spreader finally quiets down... An utterly arrogant, sulky, smoldering demon lord x a pampered little wife who gets away with everything Theme: