It could also complicate their relationship. If they find out it was a love potion that made them feel this way, they might question whether their feelings are real or just the result of the potion. Naruto, being a straightforward person, might struggle with this idea. He wants to believe that his feelings for Hinata are genuine, but the existence of the potion makes him doubt.
The love potion can initially create a false sense of love. For example, if Draco is under the influence of a love potion for Harry, he might act overly affectionate, which could make Harry uncomfortable at first. But it could also be a catalyst for them to start interacting more, which might lead to a real relationship later.
The love potion can act as a catalyst. Naruto's feelings for Sakura, which were always there but a bit subdued, might come out full force. Sakura, who might have only seen Naruto as a friend or a teammate, now has to deal with his intense love. This could lead to her re - evaluating her own feelings for him. Maybe she starts to see him in a romantic light too, or she tries really hard to bring back the old Naruto. In either case, their relationship takes a new and unexpected turn.
Often, the love potion can be a tool to test the strength of their relationship. For instance, if Hermione suspects Ron is acting strangely because of a love potion, she has to decide whether to trust their relationship enough to figure it out together. It can also add an element of drama, as they deal with the false emotions the potion brings. If not handled properly, it could lead to a temporary break - up in the fanfiction, but ultimately, their true feelings usually prevail.
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.
Sonic might be really confused if he is under the effect of the love potion. He's always been independent and suddenly having strong romantic feelings for Amy would be a big change. He might try to fight the feeling at first because it's so alien to him.
A love potion can turn their relationship upside down. Harry, normally having a somewhat adversarial relationship with Snape, would suddenly be filled with love for him. This could lead Snape to question his own feelings towards Harry. He might start to see Harry in a new light, perhaps noticing his positive qualities more. And for Harry, he might start to understand Snape better as he pursues this new - found love, even if it's not real in the beginning.
Obviously Merlin himself could be affected. He's the one with the magic and might accidentally expose himself to the potion. Arthur is also a likely candidate. As the king, if he's affected by the love potion, it would have a huge impact on Camelot. Morgana could also be a character affected. If she were under the influence of a love potion, it could change her plans and her relationships with other characters. And Guinevere too, since she has important relationships in Camelot that could be altered by the potion.
The Polyjuice Potion could create misunderstandings in their relationship. For example, if Ginny sees Harry seemingly flirting with someone who is actually him under the influence of the potion, she might get angry. On the other hand, if Harry sees Ginny acting strangely because she has been transformed by the potion, he could worry about her being under some sort of dark magic influence.
When Naruto drinks a love potion in fanfiction, the plot may start to revolve around his internal struggle. He might be conflicted between his normal self and the feelings the love potion has induced. If he's in love with someone who is from an enemy village, for instance, he has to deal with the political implications as well as his own emotions. Also, the plot could involve other characters using Naruto's love - stricken state to their advantage. Maybe an enemy tries to manipulate him through the person he loves, which would add a layer of intrigue and danger to the story.
The love potion could make Arthur see Merlin in a whole new light. He might suddenly be more trusting of Merlin's magic, which is usually a big issue between them. For Merlin, it could be a chance to get Arthur to listen to his ideas more easily.