Dear CJ,
Long time to see! How have you been doing? It's so nice to see you here. I've missed you and your impressive answers. I come to say hi but I just came up with a question,
Scenario: I've been fooling around on the street for a while and I had too much coffee, now I feel like going to a restroom. So there I see a restaurant. I come in and I say "Can I borrow the restroom"?
Does it sound natural?
If I borrow their restroom, I have no idea how to return it to them.
Yours,
Pastel