I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
Well, their married life could be full of fun. Sana's energetic and positive nature would keep the house lively. Akito, being more reserved, would balance it out. They might have a cozy home where Sana would continue her acting career while Akito manages their finances. And they would support each other through all the ups and downs, just like they did in their pre - married days.
I'm not sure where you can specifically get this light novel. You could try checking some popular online bookstores like Amazon or Barnes & Noble. They often have a wide range of light novels available.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
After getting married, Sana and Akito's relationship would evolve significantly. Sana, who is used to being in the spotlight, would now find comfort in coming home to Akito. Akito would be more involved in Sana's acting career, perhaps giving her advice or helping her with contracts. Their love would mature, and they would learn to accept each other's flaws even more. There would be a new level of intimacy, not just physically but also emotionally as they build a life together. They would support each other's dreams more than ever and create a family - like bond that is stronger than just a boyfriend - girlfriend relationship.
The cap man and monkey story is an interesting one. There was this cap man who was traveling around selling his caps. He reached a place near a forest and decided to take a rest under a tree. While he was sleeping, the monkeys in the tree noticed the caps. They climbed down, grabbed the caps, and went back up the tree. When the man woke up, he was confused at first, then saw the monkeys with his caps. He was worried as those caps were his livelihood. But then he remembered that monkeys often mimic human actions. So he took off his own cap and tossed it. The monkeys, being the imitators they are, did the same with the caps they had taken, and the cap man got his caps back.