No way. These are personal and private matters between a husband and a wife. Exposing such details in public not only makes others uncomfortable but also shows a lack of respect for the relationship and the partner. It is not something that should be shared in a public or open forum.
Well, not many mainstream literature pieces would directly have 'blow job stories' as a main plot. However, in some underground or more experimental literature, there could be mentions. But it's hard to pinpoint a specific one without a more in - depth research into the realm of edgier literature.
One should firmly tell the person that it is inappropriate and that they don't want to hear such stories. For example, you could say 'This is a private matter and I don't want to listen to this.'
No, it is not appropriate at all. Such content involves incestuous and inappropriate sexual themes which go against moral and ethical norms in most societies.