Most weekday mornings my dd14 asks me for a cup of tea when I am making one for myself as she is sincerely convinced that she has no time to make one for herself. I don't mind that, but I do mind that she is a typical lazy slobbish teenager who never clears up and never does anything for anyone else in the family. So I am torn between which of two important lessons to teach:
a) When you do something nice for me, maybe I'll feel more like doing something for you but until then no I won't make the tea.
b) We should be nice to people without expectation of reward so yes I will.