His father might be extremely proud. After all, Goku has achieved so much, like protecting the Earth multiple times. He would look at Goku with admiration for his strength and kindness.
I don't think it is. Usually, such titles suggest fictional or semi-fictional content rather than being based on real events. There might be elements inspired by real life, but it's not a pure true story.
Gohan would be really surprised, but being the kind - hearted person he is, he would try to understand and help out. He could offer to train with them in a more gentle way to keep them fit during the pregnancy. Piccolo would be more of a silent observer, but still be there in case of any threats.
The reaction among fans would be quite mixed. Some die - hard fans of the original series would be appalled as they have a clear image of ChiChi and Goku's relationship. They would see this type of fanfiction as a perversion of the original concept. On the other hand, there are those who are more open - minded and might see it as an interesting, if not controversial, exploration of the characters. But overall, the negative reactions would probably outweigh the positive ones.
Goku would be a mix of angry and worried. His Saiyan blood would make him want to rush into battle with Raditz right away. But he also knows how dangerous Raditz is, so he might first try to gather some allies, like Piccolo. He'd be constantly thinking about Gohan and how to rescue him as quickly as possible.
The meaning of 'af' in romance novels can vary. Sometimes it's just a part of modern - day slang that has made its way into the writing. Writers might use it to make their characters seem more relatable and contemporary. It could also be an acronym that the author has created for their own purposes within the story. For example, it could stand for a fictional organization like 'Alliance of Fairies' or something similar. It really depends on the context of the specific romance novel.