Perhaps the cause of Kagome becoming a child in the fanfiction could be a cursed spell from a powerful demon. This demon might have wanted to weaken Kagome's powers as she was a threat. As a child, Kagome could have some child - like innocence and different abilities. For example, she might be able to communicate with certain spirits more easily because children are often seen as more pure in such fictional settings.
Her relationship with Inuyasha would be greatly affected. He might be initially shocked and even a bit distrustful since he has had his own issues with demons in the past. But over time, he could come to accept her new form and help her control her new powers.
In the fanfiction, Kagome's enemies could underestimate her. They think that because she's a child, she's not a threat. But in reality, even as a child, Kagome still has her strong will and some of her powers. She could surprise them by using her wits and the little bit of spiritual power she has left to outsmart them. For instance, she could lead them into a trap that her friends set up.
One possible plotline could be Kagome initially struggling with her new demonic form. She might have to hide from her friends at first because she's afraid of how they'll react. Another could be that she discovers new powers along with her transformation and has to learn to control them. For example, she could gain enhanced speed or strength.
One idea could be that their relationship starts as an unexpected alliance against a common enemy. As they spend more time together, they gradually develop feelings. When Kagome discovers she's pregnant, it could bring a new level of complexity to their relationship. Sesshomaru, being a proud demon, might initially struggle with the idea of impending fatherhood but then grow into a protective and loving partner.
Sango could also take care of Kagome. As a strong and kind - hearted woman, she would know how to nurse Kagome back to health. She might use her knowledge of herbs and remedies to make Kagome feel better. Plus, she would offer emotional support to Kagome during her illness.
Well, in many fanfictions about Kagome and Inuyasha getting jealous, it usually creates some really interesting plot twists. The jealousy can be played out in different ways. Maybe Kagome gets jealous when Inuyasha spends time with Kikyo. It makes her question her place in Inuyasha's heart. And Inuyasha's jealousy might show up when Kagome is around Miroku in a friendly way that he misinterprets. These jealous moments can range from cute and petty to really intense and relationship - changing.
No. Writing about a character getting abused in fanfiction is not ethical. It promotes harmful and disturbing content. Kagome is a character who should be respected, and creating such scenarios involves spreading negativity and can be triggering for some readers.
The tattoo could also be a part of a deal she makes in the fanfiction. Suppose she has to make a pact with a powerful being in the feudal era. As a result, she gets a tattoo that binds her to the deal, and throughout the story, she has to figure out how to fulfill the terms of the pact without sacrificing her own values.
I'm not sure if there is a specific fanfiction exactly like that. Fanfiction can cover a wide range of scenarios and pairings, but this particular one might be a bit unusual considering the nature of the characters in the original story. You could try searching on major fanfiction websites to see if such a story exists.