Probalbly a common problem for many spankos: you have a need to be spanked, but you don't have a partner who is willing to spank you. And after time, it can really be frustrating.
Of course, you solve this by practising self-spanking but a self-spanking is not as good as getting spanked by another. Especially not if you need spanking within a disciplinary context - if you lack sufficient self-discipline, you probably are not suited to punish yourself. Otherwise you won't need spanking in the first place, will you?
In a short SF spanking story Mordanicus explores the idea of a spanking machine as a solution for this problem.
Juliette is a nineteen year old college student, who has trouble to do her collegework and has a tendency for procrastinating. The young woman realizes that she won't pass first year if does not get spanked for laziness.
Fortunately her parents have given her a personal robot for her birthday and she order him to spank her whenever she neglects her studies. Only her robots is programmed with Asimov's famous Three Laws of Robotics and this prevents it from spanking its owner whenever she needs it.
Juliette is trying to seek a way to get around this problem, so she can get the spankings she need.
You can read the story here.