The answer to this question is only one "I'm sorry, I can't do it".
This answer can probably only be my personal answer, and in the hearts of young people nowadays, this answer is definitely unqualified, and it is a very bad answer. This is just the honest answer of an honest person, not the answer of a person who is enthusiastic and full of warmth in the age when he can embrace the sun and the moon.
This answer is a bit cold, hard as iron, no temperature at all, it can't move people, and the possibility of beating people away is very high.
But I also suspect that there is someone who asks her boyfriend for the sun? Probably so. I don't think anyone can do it to give the sun to anyone, and if they really have the ability, who can bear the sun.
The original intention of bringing up this topic may be to say that your girlfriend wants you to do something that you can't do at all, and there is only one solution to this problem, which is not to do it. But that means it's impossible for you. Don't think about it, if you think too much, you will be unable to extricate yourself, if you don't find a way to have the sun, it means that you are still a little sober, if you really want to take a spaceship or something to go on an expedition to the sun, then it will be troublesome.
What to do when your girlfriend asks you for the sun in the sky? "Alas, break up".