It could get closer. If they are honest during the truth part, they might share deep feelings they've been hiding. And the dares could make them do silly or challenging things for each other, creating more shared memories and inside jokes.
It would likely become more cooperative. They'd have to communicate more often to take care of the pregnancy - related matters.
If Sasuke kidnapped Naruto, it could initially seem like a huge betrayal. However, Naruto is known for his ability to forgive. He might see this as Sasuke still caring about him in his own, twisted way. This could make their relationship more complex, with Naruto constantly trying to reach out to Sasuke and Sasuke struggling with his own emotions and reasons for the kidnapping.
Well, it would be quite different. If Sasuke was the village - bound one and Naruto the outcast, Sasuke would probably be more frustrated with Naruto. He'd see Naruto's actions as irresponsible and dangerous. Naruto might view Sasuke as naive for still believing in the village.
If Sasuke's sister was in the picture, Naruto and Sasuke's relationship might soften more quickly. Naruto would see another side of Sasuke through his sister. He might also feel more of a connection to Sasuke's family. Sasuke, on the other hand, would see Naruto's genuine care for his sister, which could make him trust Naruto more.
The relationship would be very different. Instead of Naruto chasing after Sasuke to bring him back, it might be Sasuke trying to reach out to Naruto. Sasuke would be the more empathetic one, constantly trying to break through Naruto's cold exterior.
On the other hand, it could cause some strain. Maybe Sasuke would start to feel trapped in this eternal existence with Naruto and long for some solitude. Or Naruto might feel that Sasuke is becoming too distant because of their immortality. However, in the end, they would likely work through these issues because of their deep bond.
Their relationship would become more affectionate. They might start holding hands, giving each other long stares, and being more physically close. Normally they are rivals, but the love potion could make them more like partners, always looking out for each other's well - being.
Well, it can change their relationship in many ways. For instance, if Draco is dared to be nice to Hermione for a whole day, it can break down some of the barriers between them. They start to see each other in a different light.
Naruto's relationship with Sasuke would likely have a new layer of respect. Naruto, having been trained by Itachi, would understand the Uchiha clan more, which is a big part of Sasuke's identity. This could make Sasuke see Naruto in a different light too. Instead of just seeing him as a rival, he might start to view Naruto as someone who is also connected to his family in a way. They could start to communicate better, with Naruto being able to speak more knowledgeably about Sasuke's family and their history.
Their relationship would likely become more complex. They might start to protect each other more fiercely. For example, Sasuke might not leave the village in the first place because he now has a closer family tie to Naruto. Naruto would also be more insistent on getting Sasuke to stay and see him as an important part of his family.