N.D. Cent. Code § 34-02-04: Gratuitous employee - Performance and care required

One who undertakes to do a service for another without consideration is not bound to perform the same unless it is entrusted to the person at the person's own request, in which case the person shall perform the service fully. If the person commences performance, the person shall use at least slight care and diligence therein. Except as otherwise provided in this section, a gratuitous employee may relinquish the employment at any time.