There could also be unexpected magical side - effects. Love potions are not supposed to be used casually. Using it on Harry, who has a very strong magical core, could backfire in strange ways. Maybe it could start to affect Dravo's own mental state, as the magic tries to balance out the unnatural situation he has created.
Harry himself might eventually break free from the love potion's effects. When he realizes what has been done to him, he could become extremely resentful towards Dravo. This could lead to a huge rift between them, and Harry might even seek revenge in some way.
One consequence could be that other characters find out. They might be very angry with Dravo for using such a manipulative method. It could lead to Dravo being ostracized by the wizarding community.
In fanfiction, if Ginny uses a love potion on Harry, one possible consequence could be chaos. Harry might act out of character, doing things he wouldn't normally do. This could lead to a breakdown in his relationships with his true friends who notice the sudden change in him. Another consequence could be that Ginny herself realizes she has made a huge mistake when she sees Harry's false love and has to deal with the guilt.
Well, he might initially be confused. Since it's a love potion, he could start having strong, uncharacteristic feelings for Dravo. Maybe he becomes overly affectionate towards Dravo, not really understanding why these new emotions are surging within him.
One possible consequence could be a moral breakdown within Harry himself. He's always been against dark magic, so using Crucio might make him question his own values. Another consequence could be alienation from his friends and allies. They would likely be shocked and appalled that he resorted to such a cruel curse.
In fanfiction, the consequences can be complex. The snake - based healing might create a bond between the healed person and the snake that has unforeseen implications. For example, they might start to have some snake - like characteristics or instincts. Additionally, the method of using the snake to heal could attract unwanted attention from dark wizards who want to use this power for evil purposes. Harry might then have to protect the knowledge of this healing method and those who have been healed, which could put him in many dangerous situations.
One possible consequence could be his estrangement from his friends. In the original Harry Potter world, his friends are firmly on the side of good. If he starts using dark rituals, they might not be able to understand or accept his actions. Another consequence could be a corruption of his own soul, as dark magic is often depicted as having a corrupting influence in the series.
Well, it depends on the specific fanfic. One consequence could be that he loses control of his actions and emotions. This might put him in dangerous or embarrassing situations. For example, he could accidentally reveal his feelings for someone in a very public and inappropriate way. It might also make him a target for those who want to take advantage of his altered state.
One consequence could be that it makes him a more formidable opponent. His enemies would have to rethink their strategies as he can now teleport.
One consequence could be that Harry starts to have confused feelings towards Malfoy. He might act out of character, doing things he wouldn't normally do, like spending more time with Malfoy or being overly affectionate.
One consequence could be that her real relationships get strained. If she already has friends or a potential love interest in the fanfiction world, drinking the love potion might make her act out of character towards them. She could neglect her true friends or push away someone who actually cares for her because she's under the influence of the love potion's false feelings.
He could lose the trust of his friends. In the Harry Potter world, his friends know him as a good person. Using Crucio would shock them and make them question his integrity.