I have a client who I have agreed to do 2 days work a month for, we have been on this arrangement for about 6 months and I always invoice him at the end of every month.
Usually the work I do takes up the time agreed and we are all happy.
However this month has been unusually quiet, and I feel uncomfortable invoicing him for 2 days work I haven't actually done or been asked to do.
DH says I should be tougher as that's the point of retainers - what do other freelancers do?