Their relationship might become a bit rocky. Harry may see Sirius as overbearing, while Sirius sees Harry as being irresponsible. However, if they communicate openly, it could lead to a deeper understanding between them. Sirius could share his own experiences with making bad choices when he was younger, which could make Harry more receptive to his advice.
It could strain their relationship at first. Sirius would be worried and disappointed, and Harry might feel resentful of being caught. But in the long run, it could strengthen their bond as Sirius tries to help Harry get over this bad habit.
Initially, it would create some tension. Harry might pull away from Sirius, feeling like he's being treated like a child. But Sirius, being persistent, would keep trying to reach out. He'd remind Harry of how much he cares about him and how smoking can not only harm his physical health but also his reputation at Hogwarts. Eventually, through all these interactions, their relationship could evolve into one where Harry respects Sirius more for his concern and Sirius respects Harry's growing independence as long as he makes healthy choices.
If Sirius hits Harry, it can initially strain their relationship. Harry may feel hurt and confused, especially if he trusts Sirius. It could lead to a period of estrangement.
Sirius might confiscate whatever Harry was smoking. He would then sit Harry down and have a serious conversation about the importance of making good choices. He could also remind Harry of the dangerous magic substances that might be out there that are far worse than normal cigarettes and that he should stay away from any form of harmful substances.
The relationship could also take a more complex turn. Other characters might get involved in their conflict. Some might side with Sirius, thinking Harry was in the wrong, while others might try to mediate. This outside influence could either help or hinder the mending of their relationship, depending on how it's handled in the fanfic.
He's probably furious. Snape has high standards for student behavior, and smoking is definitely not acceptable in Hogwarts. His face might turn red with anger, and his eyes would narrow as he glares at Harry.
It could strengthen their relationship. If Harry handles it well, it shows his maturity and trust in them. They would likely appreciate that and become even closer to him.
It can strain their relationship. If the argument is really intense, they might not trust each other as much immediately afterwards. For example, Harry might start to question Sirius' motives and Sirius could feel that Harry doesn't respect his experience.
It could bring them closer. Adrien seeing Marinette in this vulnerable and creative state might make him more attracted to her.
Sirius would be deeply affected. He'd see Harry as a sort of surrogate family, and seeing Harry in such a state would make him feel like he failed in protecting him. He'd do everything he could to make Harry feel better, from getting him medical help to just sitting and talking with him for hours about what's wrong.
It could strengthen their relationship. If Sirius is pinning Harry down to protect him, Harry might come to realize how much Sirius cares for his safety and well - being. This act of protection can deepen their bond of trust.
It could enhance their relationship if the fanfiction gives Harry new topics to talk about. For example, if the fanfiction is about a magical adventure similar to their own experiences, they can bond over it.