My honest answer:
No one knows! If you only try the things you read in this forums, you won't ever discover anything new!
If you want, take "good" (Who defines good?) advice, but modify it, and make it your own idea. Or twist it, and do the opposite of what is "normal".
Just forget on "building rapport" and try something! But do it with your heart. What are you thinking in? What will make this fun? Do that. Is it crazy? Well, all good ideas sound crazy in the beggining.
There is no specific formula for this, as there is no formula on "How to compose good music...". How do you do it? Certinally, there are some principles, there are things that are bad and you shouldn't do, but you still aren't ment to write it following strict patterns! Do it by your ear! You'll learn as you play the instrument.
For the things we have to learn before we can do them, we learn by doing them!
The key aspects are: Have plesure in everything! It's not science for you. No, you have more fun if you don't analyse it to death!
You're just exchanging words. Stop thinking of it like it's something you don't know already.
It also has to be natural! Since the beggining.
And the focus in not on building rapport. It's not on talking about others, it's not on seeking approval: It's in fun. Fun is always the ultimate focus.
If you follow all the rules, you end up loosing all the fun.
So experiment!