One possible plot development could be that Kagome is in a state of shock and fear at first. But then she might start to fight back using her spiritual powers. She could try to purify the tentacles, causing Naraku pain and making him loosen his grip.
She could use her spiritual arrows. If she manages to summon enough strength and concentration, she could fire an arrow at the tentacles. Since her arrows have purifying power, it might be enough to make the tentacles release her.
One possible plot could be that Black Cat is on a heist in a place where Dr. Octavius also has an interest. His tentacles might squeeze her as a way to stop her from getting to a valuable item first. This could lead to a power struggle between them where Black Cat uses her agility and thieving skills to try and escape the grip of the tentacles.
The plot could involve Sakura being on a solo mission when she stumbles upon an ancient relic that is somehow connected to Naraku. As she touches it, the tentacles emerge and start coiling around her. She then has to use her quick thinking and ninja skills to escape. For example, she might use her enhanced strength to break some of the tentacles while looking for a way to seal the source of the tentacles.
A possible plot could be that Naraku somehow manages to capture Kagome and tries to use her to gain more power. But in the process, there are some unexpected emotional developments between them. However, this is a very different take from the original Inuyasha story where their relationship is mainly one of enmity.
One possible plot twist could be that the pregnancy is a result of some dark magic manipulation by Naraku. Maybe he had a hidden agenda all along and used some ancient spell to impregnate Kagome. This would lead to a great internal conflict within Kagome as she has to deal with being pregnant with the child of her enemy.
Well, a plot could involve Naraku being cursed to feel all the pain he has caused, and Kagome is the only one who can ease his suffering. So he has to follow her around. Or perhaps in a fanfiction, Naraku and Kagome get trapped in a magical realm where they have to rely on each other to survive. Also, a story could be about Naraku having a split personality, and one part of him is attracted to Kagome and tries to break free from his evil self to be with her.
In fanfiction, the relationship between Kagome and Naraku can be very complex. Some fanfictions might explore the idea of Naraku having unexpected feelings for Kagome or vice versa. It could be a way to rewrite their antagonistic relationship in the original work and give it a new twist.
Another scenario could be that Naraku has some ulterior motive for kidnapping Kagome. Maybe he wants to use her spiritual powers for his own evil purposes. He could try to corrupt her or force her to use her powers against Inuyasha and the others. But Kagome would resist with all her might, and her love for Inuyasha and her friends would give her the strength to hold out until they come to her rescue.
I'm not entirely sure as it could vary greatly depending on the author's creativity. It might involve Sakura from a particular series in a difficult situation within Naraku's tentacles, perhaps in a battle or some sort of captivity scenario in the context of fan - created fiction.
In this fanfiction, it could be that Kari is exploring an ancient, cursed place. As she ventures deeper, black tentacles emerge from the shadows and start grabbing at her. These tentacles might be a manifestation of the curse. Kari's journey could then be about finding the source of the curse and breaking it to stop the tentacles from attacking her. She might meet other characters along the way who either help or hinder her progress.