One possible motive could be that he has new and important information. For example, he might have found out some insider trading information if it's a business - related meeting. So he interrupts to expose it.
Peter could be motivated by his own ambition. He has an idea for a project that he thinks is better than the current one being discussed in the meeting. So, in order to get his idea heard and potentially implemented, he interrupts the meeting. He believes his idea will bring more success to the group or company, and he's willing to take the risk of interrupting to share it.
One possible motive could be political ambition. Maybe Peter wants to take over the emperor's power and position in the fictional world. If the emperor has a lot of control and influence, Peter might see killing him as a way to gain that for himself.
Love could be a strong motive. If Tobias has feelings for Tris, he would naturally want to protect her from harm, especially from someone like Peter who might be a bully or a threat.
In the fanfiction world, there could be a prophecy or a pre - determined fate that Tony believes in. He may think that Peter's sacrifice is necessary to fulfill this prophecy and save the world from some greater threat related to the Soyl Stone. He might see it as a selfless act in the long run, even though it seems cruel.
Peter Pan might be jealous of Henry. Maybe Henry has something that Peter Pan desires, like a special magical ability or an object. So, to get it for himself, he endangers Henry.
Maybe Peter has some urgent news to share. For example, he might have discovered a new threat to the city or a problem related to one of their projects. He could also be in trouble himself and needs Tony's immediate help.
It could also be for revenge. Perhaps Stiles or someone associated with him has wronged Peter in the past within the context of the fanfiction story. So, Peter kidnaps Stiles to get back at him or those related to him. Another reason might be that Peter is being controlled by some other force. There could be a dark entity manipulating Peter's actions, and it makes him kidnap Stiles for its own sinister purposes.
It could be that Peter has some sort of knowledge or information that the kidnappers want. For example, he might have accidentally witnessed a crime and the criminals want to keep him silent.
Well, in this fanfiction, Peter Parker might meet the Avengers in a more casual setting. For example, he could be at a science expo where some of the Avengers are also present. Peter is there to show off his latest web - shooter design. The Avengers notice his intelligence and his unique abilities as Spider - Man. They then start a conversation with him, and from there, a relationship between Peter and the Avengers begins to form. This could lead to Peter getting involved in more Avengers - level missions and growing as a hero.
One possible motive could be that the souk stone has some sort of power that Tony is desperate to obtain. Maybe it can grant him ultimate power or fulfill a long - held desire, and Peter is just an obstacle in his way.
A possible motive could be revenge. If a dragon had hurt someone he loved, like his father or Astrid, he might be driven to kill it. It would be a very emotional and difficult decision for him, but his love for his friends and family could push him to that extreme.