Well, a simple idea could be that the pregnancy is a secret at first. Only a few close allies know. Jon and Daenerys have to be very careful to keep it that way. They might have some close calls where the secret almost gets out, adding a lot of tension to the story.
Sometimes, characters like Arya Stark are paired with Daenerys. Arya's skills as an assassin could be used to eliminate key targets in Daenerys' revenge plan. Their combined strength and determination would make a formidable force against their enemies.
Jon Snow is often included. His connection with Daenerys in the original series makes him a popular addition in fanfiction. He might team up with Daenerys to fight a common enemy or have a more complex relationship with her.
Well, a smut novel refers to a book where the focus is heavily on sexual themes and often has very detailed and graphic descriptions of sexual acts. It's not for everyone and is usually considered more adult-oriented.
Well, it depends. If it's just an occasional read for entertainment and the person can clearly distinguish between fantasy in the novels and real - life values, it might not be too harmful. But if it starts influencing one's behavior or attitudes towards others in a negative way, then it's not healthy. For example, some smut novels may promote objectification of people, which is not a good value to uphold.