After I Transmigrated into a Book, I Became the Regent's Beloved

(1v1, both leads are virgins, devoted romance, bubbly heroine vs. poker-faced hero) After finally transmigrating into a book, Ai Nuan discovers she’s become a little widow who’s supposed to compete for someone else’s favor, and a disposable extra who doesn’t even make it past the first episode. To save her own skin, Ai Nuan decides to cling to the male lead’s powerful leg. “Your Highness, I know everything from astronomy to geography. I can help you make plans!” Ai Nuan says obsequiously. “Your Highness, I’m an excellent masseuse. I guarantee you’ll feel wonderful!” Ai Nuan says ingratiatingly. “Your Highness, I’m a superb cook. I can take the best care of the Dowager Consort!” Ai Nuan says flatteringly. As time passes, even Ai Nuan starts to think she’s just too useful for Nan Jingsi to bear killing her. Then one day… The prince finally comes to his senses. Keeping a widow in his residence would be disgraceful, so he orders his men to drag her out and execute her. The little widow, held fast by the guards, is close to tears. “Wouldn’t it be enough if I had your child, Your Highness? I’ll have as many as you want!”