It could be out of a sense of possessiveness. Sasuke has always had a complex relationship with Naruto. He might see Naruto as someone very important to him and in his own warped way, forcing him into marriage is a way to keep Naruto by his side forever.
One reason could be for power. Combining their strengths through marriage could make them an even more formidable force. Maybe Sasuke saw it as a strategic move to protect their village or to face some greater threat that they are not aware of yet.
Perhaps Sasuke is trying to atone for his past wrongs. He knows he has hurt Naruto in the past and by forcing this marriage, he thinks he can make it up to Naruto in some way. He might believe that by binding them together in this way, he can ensure Naruto's safety and also have a chance to be a better person for Naruto.
One possible reason could be that Sasuke is trying to protect Sakura in his own twisted way. He might think that by making her his wife, he can keep her safe from the dangerous world they live in. Another reason could be related to his family. He might see marriage to Sakura as a way to rebuild his family name or something similar. However, his method of forcing her is completely wrong.
Well, one possible plot could be that after years of fighting side by side and having a deep understanding of each other, Sasuke finally realizes his true feelings for Naruto are more than just friendship. He might plan a very private and special moment to pop the question. Naruto, being the open - hearted person he is, would be initially shocked but then consider it seriously as he also values Sasuke deeply.
Well, at first it would be really rocky. Naruto might be angry and resentful towards Sasuke for forcing him into this situation. But as time goes on, they could start to understand each other better. Sasuke might realize the harshness of his actions, and Naruto could see that Sasuke had some deeper reasons, perhaps related to protecting Naruto in his own twisted way. Eventually, they might find a way to build a real relationship based on mutual respect and love that grows from their shared experiences.
One reason could be political. Maybe the two clans or villages that Naruto and Sasuke are associated with want to strengthen their alliance. By marrying their most powerful members, they hope to ensure peace and cooperation.
Well, one possible plot could be that due to some political or clan reasons in the ninja world, Naruto is forced into a marriage with Sasuke. Maybe there's a threat from an outside force that can only be averted if the two most powerful ninjas, Naruto and Sasuke, are united through marriage. Naruto might initially be resistant as he values his friendship with Sasuke in a different way, but gradually realizes that this union could also bring about a new era of peace and understanding between their respective clans.
The relationship would evolve from a deep friendship and comradeship to a romantic partnership. They would have to be more open with each other about their feelings. Sasuke might become more protective of Naruto in a different way, not just as a friend in battle but as a future life partner. Naruto would also be more likely to confide in Sasuke about his insecurities and hopes for the future. Their bond would be strengthened further as they face the challenges of being in a relationship in the ninja world, like dealing with the opinions of other ninjas and the political implications of their union.
One reason could be that Sasuke realizes he needs Naruto's unique abilities. Naruto has the Nine - Tails' power which could be useful in a certain task. So he takes Naruto with him to achieve a common goal.
At first, it would be really awkward. Naruto might be all over the place, trying to make the best of the situation, while Sasuke would be cold and distant. But as time passes, they would start to communicate more. Naruto's positive attitude might slowly break down Sasuke's walls. They could start training together again, like old times, but with a new layer of closeness. Eventually, they might develop a deep respect and love for each other that goes beyond friendship.
At first, Naruto would be in disbelief. She has always seen Sasuke as a friend or a rival, not a marriage partner. So, she would likely be very vocal about her opposition. She might gather her friends, like Sakura and Kakashi, to support her cause. She could also try to appeal to Sasuke's sense of justice. Since Sasuke has his own code of ethics, he might also not be happy about this forced situation. Naruto could use this to try and find a way to break free from this unwanted marriage.
One possible reason could be his over - protectiveness. Edward might think that marriage would legally bind Bella to him and he could better protect her from the various dangers in their world, such as other vampires. He may believe that as his wife, he could keep a closer eye on her.