Kinktionary
More like guidelines and a lot less like definitions.
duck
A sub in a D/s relationship for whom what may come naturally often looks difficult to an outsider, but is nonetheless appreciated by their mate(s) and admirers.
Ducks are feisty, wild and a reluctant pet. Often found pecking at & quacking very loudly when being told what to do. Ducks are fiercely protective of those they care about & very willing to defend their position.