Yang Yuhuan recognized An Lushan as his son, mainly because An Lushan was not an ordinary person. When An Lushan was a child, his family was poor. Later, he worked hard in business and made a lot of money. He speaks six languages, has been an agent for businessmen from all over the world, has rich social experience and is good at dealing with people, which is very likable. In this way, he got through the relationship with the imperial court and gained a good reputation. Later, he met Li Longji, was appreciated by Li Longji, and was promoted step by step. An Lushan gave Li Longji a beautiful woman, which made Li Longji very happy. An Lushan was fascinated by Yang Yuhuan for the first time. Later, he looked a little lost in thought and rude, but the clever An Lushan was very talkative and praised Yang Guifei's maternal brilliance, which resolved the embarrassment on the spot.
Yang Guifei was much loved in the palace, and from then on An Lushan fawned on Yang Guifei. The Anshi Rebellion is a local time, with a wide network of contacts, heavy power and high position. Yang Guifei also hopes to help Li Longji stabilize such a person. In fact, she was afraid of his rebellion, but she didn't recognize her adopted son. As an emperor, it is inevitable that she will lose her dignity. Only An Lushan offered to recognize her mother, and Li Longji could not refuse. Originally, both of them had ulterior motives and each had its own plans. This is also a hit. After recognizing the mother and son, they kissed each other.
Generally speaking, it is impossible for Li Longji to know about his son's adoption. It's just a formality for Yang Yuhuan to bathe his son An Lushan. In order to make this recognition more formal, it's not the kind of naked bath for men and women you imagine, or just rubbing your back or something. Since it is a happy event, it is normal to reward.