Well, at first, it might be a bit of a shock for both of them. Tsukiyama, who is used to a certain dynamic with Kaneki, would have to adjust to being more of a caretaker. Kaneki would also have to deal with the physical and hormonal changes of pregnancy, which could make him moody. But as time goes on, they would grow closer. Tsukiyama would be there for every doctor's visit (if there are such things in their world), and they would start planning for their future together as a family. They would have to face their own insecurities and fears about becoming parents, but through it all, their love for each other would deepen.
During the pregnancy, Tsukiyama's possessiveness over Kaneki might increase. He would see Kaneki as not only his beloved but also as the carrier of his child. This could lead to some overprotective behavior, which Kaneki might find both endearing and a bit suffocating at times. Kaneki, on the other hand, would be experiencing a whole new side of himself. He would be more vulnerable, and this would make Tsukiyama more tender towards him. Their relationship would shift from a more equal footing to one where Tsukiyama takes on a more dominant protective role, while Kaneki is in a more submissive position of needing care. But this new dynamic would also bring out new levels of love and understanding between them.
Another plot could revolve around how they deal with the reactions of the other characters. Some might be accepting, while others could be horrified or even try to harm Kaneki. Tsukiyama would have to use his influence and power to protect Kaneki and their unborn child. The pregnancy could also be a symbol of a new beginning for the relationship between ghouls and humans, if they can prove that such a thing can happen and be managed.
Their relationship might become more tender. Obanai, who is usually aloof, could become more protective of Mitsuri. Mitsuri, on the other hand, might rely more on Obanai for emotional and physical support.
Their relationship would likely become more intimate in some ways. Ciel, who is usually stoic, might show more of his softer side to Elizabeth. He would be more concerned about her well - being, not just as his fiancée but as the mother of his child. Elizabeth would also feel closer to Ciel, seeing this new side of him. They would probably spend more time together, with Ciel making sure to be there for important doctor appointments and such.
Their relationship would likely become more protective. Sesshomaru, being a powerful demon, would be extremely vigilant about Kagome's safety and the safety of the unborn child. He might not show it in the most obvious ways at first, but his actions would speak volumes. For example, he would be more likely to stay close to her or send his minions to guard her when he couldn't be there.
During the pregnancy, their relationship could deepen in many ways. Sasuke might open up more about his feelings. He's always been a bit of an enigma, but with a baby on the way, he'd have to be more communicative. Fem Naruto would also start to see a softer side of Sasuke. They'd have to work together more closely, like when it comes to preparing for the baby's arrival, which would strengthen their bond.
They would likely become more protective of each other. Hook would be more cautious in his pirating adventures, not wanting to leave Wendy alone for too long. Wendy would also be more concerned about Hook's safety, knowing she and the baby depend on him.
Their relationship would likely become more protective. Kili, being a dwarf, would be very protective of Tauriel and their unborn child. He might become more cautious and less reckless in his actions. Tauriel, on the other hand, would also be protective but in a more nurturing way. She might use her elven knowledge of healing and nature to ensure the well - being of the baby.
Their relationship might become more intimate as they share this unique experience. They would rely on each other more for emotional support.
Their relationship would likely become more protective. Madara, who was once a fearsome warrior, might soften and become extremely protective of Sakura and the unborn child. Sakura, on the other hand, would use her medical knowledge to ensure the health of the baby and also rely on Madara for emotional support in a different way than before.
During the pregnancy, their relationship would deepen. Severus would use his knowledge to take care of Hermione, like making special potions for her well - being. They would have to communicate more about their future and the baby's future. They might face some challenges, like Severus' past reputation causing some issues, but they would work through them together, growing closer in the process.