How about a new story in which the father-in-law "pinch-hits" for his sterile son? It could be a clandestine relationship or the son/husband could give his blessing (and even be there to watch his father make love to his bride). The family resemblance in the child's appearance would fool anyone.
I like this scenario because, thought unlikely, it is plausible (it is most often explained by the fact that the couple can't afford artifical insemination and the wife wants a child of her own). Perhaps the husband objects to artificial insemination with a stranger's sperm, and thus the couple (or the wife secretly) turns to the family member they care about most.
On the other hand, it could also be a brother who does the honors. It seems to enhance the story when the husband's curiosity/jealousy gets the better of him and he goes to the bedroom to watch the lovemaking taking place. He ends up being incredibly aroused by the sight of his own brother fucking his wife.
Is this too "vanilla" for most here?
I like this scenario because, thought unlikely, it is plausible (it is most often explained by the fact that the couple can't afford artifical insemination and the wife wants a child of her own). Perhaps the husband objects to artificial insemination with a stranger's sperm, and thus the couple (or the wife secretly) turns to the family member they care about most.
On the other hand, it could also be a brother who does the honors. It seems to enhance the story when the husband's curiosity/jealousy gets the better of him and he goes to the bedroom to watch the lovemaking taking place. He ends up being incredibly aroused by the sight of his own brother fucking his wife.
Is this too "vanilla" for most here?