How Can My Sister Be a Master of Cultivating Immortals?

I want to ask, what should I do if my adopted sister is a complete chuunibyou? She keeps saying that she is the empress of the world of immortality! But what should I do if I find out that everything she said is true? She really was the empress of the world of immortality! ? What else can I do, of course, hold my thighs tightly! Boss, you and Kuoluo! Boss, you fried chicken for the first time!