One plotline could be that they are forced to work together on a dangerous magical project. During this time, they start to see each other in a new light and fall in love, which eventually leads to having a son.
Maybe there's a prophecy that their son will be the key to saving the wizarding world. So, they come together, initially reluctantly, but over time develop feelings and have a child as part of the prophecy's fulfillment. It could also involve them facing opposition from both the Gryffindor and Slytherin sides because of their relationship.
I'm not sure of a specific fanfiction on this. But you could try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just type in 'Hermione has Blaise son' in the search bar and see what comes up.
One interesting plotline could be Draco and Blaise competing for Hermione's attention in a magical school setting. Maybe they start off as rivals but then realize they have more in common when it comes to their feelings for Hermione. Another could be a story where Hermione has to choose between them while they are all involved in a dangerous adventure against dark magic.
A frequent plotline involves their family drama. With Hermione being a Muggle - born and Draco and Blaise from pure - blood families, there would be a lot of family issues to deal with. For example, how would the Malfoy family react to having a Muggle - born as part of their family? Also, they might be forced to work together to protect their family from threats. Maybe an old enemy of the Malfoy family targets them because of their new family situation. There could also be a plotline where they explore their magical abilities together and discover new and unique forms of magic due to their special connection as triplets.
One possible plotline could be Hermione getting to know Dolohov in an alternate universe where he has a different side to him. Maybe she discovers some hidden good in him and tries to redeem him.
A possible plotline could be Hermione getting captured by Greyback's pack. She then has to use her wits and magic to escape. Maybe she befriends a young werewolf within the pack and uses that connection to her advantage.
Maybe it's a post - Hogwarts story where Hermione, in a more grown - up and jaded world, takes up smoking as she faces the challenges of the wizarding world politics or her own personal demons. It could be a way for the author to show her in a more complex and less - than - perfect light, adding a new dimension to her character.
One possible plotline could be that Hermione travels back in time and becomes Harry's mother. This would involve a lot of time - travel magic and dealing with the consequences of changing the past.
One possible plotline could be Harry struggling with his new - found identity and the powers that come with being Satan's son. He might be shunned by his friends in the wizarding world who see him as a threat.
One possible plotline could be that Harry discovers his true parentage as Loki's son and has to deal with the shock and confusion. He might then start to explore his new - found heritage, learning about Norse magic and mythology. Another plotline could involve the wizarding world's reaction to this revelation. They might be suspicious or even afraid of Harry's new connection.
Well, in some 'peter is pepper's son fanfiction', there could be a plotline where Pepper tries to protect Peter from the dangerous superhero world that she has witnessed through her association with Tony. But Peter, being the hero - at - heart person he is, rebels against this over - protection. This could lead to conflicts between them. Another possible plot is that Peter uses Pepper's resources and connections to further his own superhero career in a more organized and efficient way. And perhaps there could be a story where Peter's scientific mind combines with Pepper's business acumen to create something new and amazing for the world.