No, it's not a common type of story. Such a story with this specific topic is rather niche and might be considered inappropriate or too private for general discussion.
Sharing such explicit sex stories is not appropriate. These are private and often involve vulgar and inappropriate content that goes against social ethics and good taste.
I'm not sure specifically which 'wife dildo story' you are referring to. There could be many fictional or personal accounts with such a title. It might be a made - up story in a certain adult - themed context, but without more details, it's hard to say exactly.
It can be appropriate in certain creative and consensual adult spaces. For example, in erotica writing where the readers are aware of and interested in sexual - themed stories. However, in mainstream literature or in places where there are moral and ethical boundaries regarding sexual content, it would not be appropriate.