Well, it depends on what you consider 'good'. There are definitely fanfictions out there about Kagome and Touga. Some might focus on a romantic aspect, while others could be more about a platonic bond. Try searching on popular fanfic platforms and read the reviews to find ones that suit your taste.
Often, love and loyalty are common themes. The story might revolve around how they fall in love despite their differences. Also, the theme of sacrifice can be present. For example, one of them might have to sacrifice something from their own world or way of life to be with the other. There can also be themes related to family acceptance, as their relationship may face challenges from their respective families or groups.
One idea could be to explore the emotional turmoil Kagome experiences. She might be conflicted between her feelings for Inuyasha and this unexpected situation with Touga. The story could focus on how she copes with the pregnancy in a world full of demons and magic, and how the other characters react to this news.
I haven't read that specific fanfiction, so I can't summarize it directly. But generally, in such a story, Touga might use his strength, knowledge or some special powers to rescue Kagome from a life - threatening situation. Maybe she's in danger from a powerful demon or some other perilous circumstances.
In such a fanfiction, there could be emotional turmoil for Kagome, potential marital problems for Touga, and maybe social stigma. It's a recipe for a lot of chaos and heartache.
One plot twist could be that Touga is actually in league with the ones who put Kagome in danger at first, but then has a change of heart. Another could be that the method to save Kagome is something completely unexpected, like it requires a sacrifice from Touga that he wasn't aware of when he started the rescue.
First, avoid making it overly sexualized. Focus on the emotional and plot - driven aspects. For example, you can write about the shock and confusion that Kagome feels when she discovers she's pregnant. This can be a starting point for exploring her character development further.
One possible aspect of Inuyasha and Kagome's relationship in fanfiction could be their growth as individuals. In the original story, they both had their own personal journeys. In fanfiction, this could be further explored as they come to terms with their feelings for each other. For example, Kagome might have to balance her modern - world values with the feudal era she often finds herself in. Inuyasha, on the other hand, could be learning more about loyalty and commitment as he and Kagome get closer. Their 'mate' relationship in fanfiction could be a way to show how they support each other through all these changes.
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.
Kagome would most likely be very angry. After all, being kidnapped against her will is a huge violation. She would probably yell at Sesshomaru and demand to be released immediately.
A possible plotline could be that Sesshomaru has to prove himself worthy to Kagome's family and friends. Since he has a reputation as a somewhat cold and aloof demon, this won't be easy. When Kagome gets pregnant, it adds more pressure. He has to show that he can be a reliable partner and father. Meanwhile, Kagome is trying to figure out how to combine her modern - world knowledge with the ways of the feudal era when it comes to raising a child.