According to the information you provided, I recommend you to read "The Great Tang's Free and Unfettered Prince Consort". The main character Su Cheng transmigrated back to the Great Tang and was forced to marry a princess to become the prince consort. However, he wanted to live a carefree life of poetry, wine, and romance. In the end, he was conferred the title of Prince Xiaoyao. It also mentioned his marriage with Li Xiu Ning and Li Shimin's reward. I hope you like my recommendation. Muah ~