I have a good friend but I don't see her very often. But every time her DD visits with her she wants to borrow a toy and expects my DD to borrow a toy when she visits her.
I'm not very keen as we don't see her that often and usually her DD wants to borrow my DD's favourite toy and it puts me and my DD (6) in a difficult position. Usually my DD says yes but then regrets it when she doesn't get it back for ages. And my DD doesn't even want to borrow a toy from her.
My friend kind of expects it though and certainly doesn't discourage it when her DD asks to borrow something. She said she thought another friend was a bit odd when she objected. The thing is I find it difficult to say no.