One possible plotline could be Peter showing off his Spider - Man powers to his friends at a party. He might do some cool acrobatics and web - slinging tricks to amaze them.
Maybe Peter enters a superhero competition in the fanfiction and he shows off his skills to win. He uses his Spider - Sense to anticipate his opponents' moves and then shows off his super strength and agility.
I'm not sure specifically which 'Peter shows off Spider - Man fanfiction' you're referring to. There are many fanfictions out there with different takes on Peter and his relationship with his Spider - Man identity. Some might show him showing off his powers to impress friends, while others could be more about him flaunting his superhero status in the context of the Marvel universe's complex social dynamics.
One possible plotline could be that Spider - Man accidentally gets drunk at a party and then has to deal with a small - time criminal while being in that state. His reaction time might be slower and he has to rely more on his instincts.
A plotline could be Gwen and Peter's time - traveling adventure. They might end up in different eras of the Spider - Man universe and have to find a way back while also facing the challenges of those times. For example, they could end up in the era of the original Spider - Man comics and interact with the characters from that time.
In some fanfictions, Peter might die heroically while saving the city from a powerful villain like Venom. He could sacrifice himself to protect his loved ones and the innocent.
One reason could be that he's on a dangerous mission. Peter might think that his enemies could use Mary Jane against him. So, to protect her, he decides to keep his distance. For instance, if a powerful villain has threatened to harm those close to Spider - Man, Peter would rather stay away from Mary Jane to keep her out of harm's way.
Future Spider - Man stories might explore his relationships more deeply. For instance, his relationship with MJ could face new tests. Maybe she gets involved in a dangerous situation because of her connection to Spider - Man, and he has to rescue her. Additionally, his relationship with his aunt May could also be a focus. She could fall ill, and Spider - Man has to balance his superhero duties with taking care of her. And then there could be a plot where Spider - Man discovers a new power within himself, something that he didn't know he had. This new power could be the key to defeating an old enemy who has returned stronger than ever.
There could also be a plotline where Spider - Man tries to cure Venom of his symbiotic nature. He might see Venom as a victim of the symbiote rather than just a villain. This would lead to a journey of discovery for Spider - Man as he tries to find a way to separate Venom from the symbiote without killing him.
One possible plotline could be that Spider Man is betrayed by his closest friends in the fanfic. Maybe they believe false rumors about him being a villain or working for the enemy. This could lead to a lot of action-packed scenes where Spider Man has to prove his innocence while also fighting against the bad guys.
One plotline could be that a female friend of Spider - Man's is pregnant and he has to protect her from villains who might target her because of her connection to him. Another could be that a female scientist in Spider - Man's world is pregnant and she discovers something about her pregnancy that has implications for the city's safety, and Spider - Man has to help her figure it out.
One possible reason could be that Peter is really good at hiding it. He's careful with his actions and words around Tony, so Tony just doesn't suspect. For example, he always changes out of his suit before meeting Tony.