In fictional scenarios where a mature adult wife gets seduced, one possible consequence could be a strain on her marriage. Her relationship with her spouse might become filled with mistrust and jealousy. For example, in some stories, the discovery of the seduction can lead to arguments and a breakdown in communication between the couple. The wife may also experience guilt for her actions, which could further complicate her emotional state and her relationships with those around her.
A potential consequence is the impact on her family as a whole. If there are children involved, they might sense the tension in the family environment. In fictional stories, this can sometimes be shown as the children acting out or becoming withdrawn. The family unit may be disrupted, and there could be financial implications as well, such as if the couple decides to separate due to the situation. The seduction can set off a chain of events that completely alters the dynamics of the family.