He usually laughs a lot. Spiderman, being a young and energetic character, would likely find the tickling both surprising and hilarious. His natural reaction would be to try and squirm away while laughing uncontrollably.
The three Avengers could be Iron Man, Captain America and Thor. Iron Man could provide the high - tech gadgets and strategic thinking. Captain America would bring leadership and his combat skills. Thor with his godly powers like lightning and super strength would be a great addition. They would each have different interactions with Spiderman, for example, Iron Man might be like a mentor to him, while Thor could be more of a friendly rival in terms of strength.
One great 'Avengers and Spider - Man fanfiction' is 'The Friendly Neighborhood Avenger'. It combines Spider - Man's street - level heroics with the grandeur of the Avengers. It has an interesting plot where Spider - Man has to teach the Avengers some of his unique ways of dealing with small - scale threats while also learning from them about handling large - scale disasters.
There's also 'Spiderman's Avengers Adventure'. This fanfic delves into what would happen if Spiderman had to lead the Avengers in a crisis situation. It's full of character development, especially for Spiderman as he steps up to the plate. The story has a great balance between his quippy nature and the seriousness of the situation.
It depends on the type of fanfiction. In some darker or more angst - filled fanfictions, it is quite common as it adds drama. However, in more positive or team - building - focused fanfictions, it's not as common. These types of stories usually focus on the Avengers and Spiderman working together and getting along. So, it varies from one type of fanfic to another.
Spiderman's reaction could be complex. He might start by being intrigued by the idea of fanfiction in general. As he reads the 'Spiderman Homecoming' fanfiction, he might be impressed by the attention to detail some fans put in. He may also be a bit embarrassed if there are overly sappy or romantic interpretations of his character. At the same time, if there are fanfictions that show him in a negative light, he might feel the need to defend himself, but overall, he'd probably see it as an interesting part of his popularity and the fans' creativity.
Spiderman would probably be really confused at first. I mean, Deadpool is not your typical villain. He'd likely try to talk Deadpool out of whatever crazy plan he has. He'd be using his quick wit and trying to reason with Deadpool, saying things like 'This is not the right way to do things, Deadpool.'
Spiderman might use his agility and web - shooting abilities. He could quickly web up Venom, restraining his movements and preventing him from attacking the Avengers.
The other Avengers would be devastated. Iron Man, for instance, might feel guilty as if he could have done something more to protect Spiderman. He might become more withdrawn and focus even more on creating better technology to prevent such tragedies in the future.