The problem with favors is that people always want something in return. They'll say they don't, but they invariably do which is why it's never a good idea to put yourself at someone else's disposal unless you really have to. Be ready for the other shoe to drop on June 11th when Mars squares Pluto in Aquarius. What's being asked of you isn't repayment, but rather a request for you to look the other way regarding a certain situation. It pains you to do this but you may have no choice. Meanwhile, learn from your mistake and vow never to compromise yourself like this again.