The story could end with Kaoru returning home. After running away and having time to think, she realizes that running away wasn't the best solution. She faces her family and friends, and they all come together to support her during her pregnancy.
Maybe the ending is bittersweet. Kaoru gives birth during her time away, but she has to give the baby up for adoption because she realizes she can't provide the life the baby deserves. However, she also finds a new purpose in life and is determined to make a better future for herself.
It could end with Kaoru finding a new community that accepts her and her baby. She might build a new life there and raise her child happily.
One possible plot could be that Kaoru runs away to protect the unborn child from some sort of danger or unwanted situation in her current environment. Maybe there are people who don't approve of her pregnancy and she feels the need to escape to a place where she can raise the child in peace.
There could potentially be such a fanfiction, but it's not a very common or well - known trope in general fanfiction. It really depends on the fandom or the creative minds of individual fanfiction writers. Maybe it exists in a very niche or specialized area of fan - created works. You might also consider reaching out to fanfiction communities or forums to ask if anyone has heard of or read such a story.
Kaoru could try to gain the trust of one of the kidnappers and then use that opportunity to escape. For example, if there's a less hardened kidnapper among them, she could pretend to befriend them and then make a run for it when they let their guard down.
It could be a former patient of Kaoru's who has some mental issues. He might have misinterpreted Kaoru's care as something more and when she didn't reciprocate in the way he wanted, he decided to kidnap her.
Perhaps in this fanfiction, Kaoru is kidnapped because of her special skills as a nurse. There could be an underground group that needs her medical expertise for some illegal or secretive operation. So, they abduct her to force her to work for them.
Well, she might be held for ransom. Maybe the kidnappers think that as a nurse, she has access to valuable medical information or drugs that they can sell on the black market.
It could be a jealous coworker. Maybe they feel that Kaoru is getting all the attention or a promotion they wanted. Another possibility is a patient who has become obsessed with Kaoru during their treatment. Or perhaps it's someone from Kaoru's past who has a grudge against her.
One plot idea could be that the kidnapper has a personal vendetta against Kaoru. Maybe Kaoru witnessed something she shouldn't have, and the kidnapper wants to keep her quiet. Another idea is that it's a case of mistaken identity, and the real target was someone else in the same hospital. A third idea could be that a deranged fan of Kaoru's kidnaps her in an attempt to make her their own, thinking they can 'protect' her from the outside world.
The relationship between Kenshin and Kaoru would be transformed. There would be a new level of vulnerability in their connection. Kenshin, with his past, might be extra cautious and try to create a safe and peaceful environment for Kaoru and the baby. Kaoru would be going through hormonal changes and would need Kenshin's understanding. They would spend more time together, sharing their dreams for their child. Their love would grow deeper as they face the challenges and joys of pregnancy side by side.
Well, it might be that the kidnapper has some sort of medical need that they think Kaoru can fulfill. Since she's a nurse, they could be desperate for medical attention that they can't get through legal means. Or perhaps there's a villain in the fanfiction who just wants to create chaos in the hospital by taking one of its nurses, and Kaoru happened to be the unlucky one.