The Dursleys would most likely be horrified. They have a deep - seated hatred and fear of magic, and Ron and Hermione are clear representatives of the magical world. Vernon might turn red in the face and start shouting, while Petunia would clutch her pearls and Dudley would cower behind them.
The Dursleys' reaction could be quite extreme. Vernon would be enraged at the intrusion of these 'abnormal' beings into his 'normal' Muggle world. He might threaten to call the police. Petunia would be disgusted and would try to distance herself from them. Dudley, having had some previous encounters with magic through Harry, might be a bit more subdued but still frightened. Their overall reaction would be one of trying to protect their Muggle - centric view of the world from the encroachment of magic represented by Ron and Hermione.
They would probably be horrified. The Dursleys have always despised magic and those associated with it. Teddy, being a young wizard, would represent everything they dislike. They might try to shoo him away or call the police, thinking he's some sort of freak.
Hermione would probably be deeply hurt at first. She trusts Harry and Ron so much, and being abandoned by them would be a huge blow. But she's also very determined. So, she might throw herself into her studies even more, using her knowledge as a way to cope and also to find a solution to the situation.
They might be terrified. The Dursleys are used to a normal, non - magical world, and Harry's family is full of magic. They could see something as simple as a wizard apparating and completely freak out.
At the beginning, Ron would likely be in shock. He had always thought he and Hermione had a special bond. After the shock, he might become a bit bitter. However, his friends, like Harry, would probably try to cheer him up and help him see that there are other things in life. Eventually, Ron might find a new purpose in his life, whether it's in his magical studies or in exploring new parts of the wizarding world, and try to move on from Hermione.
Ron would be devastated. He might initially be at a loss for what to do. But then his Gryffindor courage would kick in. He'd start researching every possible cure or treatment for her injuries. He'd be the one to comfort Harry and the others while also being the most vocal in demanding justice for Hermione. His relationship with Hermione, whether you see it as just friends or something more, would make him act in a very passionate and protective way.
At first, Harry might be confused. He would try to figure out what went wrong. He might search his memory for any signs that could have led to this betrayal. Then, he would likely experience a range of emotions from sadness to rage. Depending on the nature of the betrayal, he could either try to win them back by showing them the truth or decide that they are no longer worthy of his friendship and focus on his own path, maybe even leaving the wizarding world for a while to clear his head.
Well, Hagrid would be extremely happy for them. He might offer to take the baby on rides on his back when it's old enough. He would also give them some really large and warm hugs of congratulations. Cho might be a bit more reserved in her reaction, but still polite and happy for them. She might offer some advice on how to balance a family life with their wizarding duties. And the Hogwarts professors, like McGonagall, would probably send them well - wishes. McGonagall might even offer some special tutoring for the future child if it shows magical aptitude early on.
Harry's reaction would depend on the nature of the fanfiction. If it's a cute, romantic fanfiction about Ron and Hermione, he might smile to himself and think it's kind of sweet. However, if it's something that distorts their characters or has a negative slant, he could get defensive. He might even try to find out who wrote it and why they would write such a thing about his friends.
Hermione would likely be very angry at first. She is a strong - willed character and being kidnapped would go against all her principles of freedom and rights. She would probably try to reason with Ron immediately, using her logical arguments to make him see how wrong his actions are.
He could also be heartbroken. Ron might withdraw into himself, spending a lot of time alone in his room at the Burrow, not wanting to talk to anyone. He may start to doubt his self - worth, thinking that he wasn't good enough for Hermione.