Yes, there are quite a few. Some fanfictions might have the Avengers reacting humorously to Vines. For example, they could be sitting in the living room at the Avengers Tower and suddenly start watching Vines on a big screen. Tony Stark might make sarcastic comments about the Vines, while Steve Rogers is just trying to understand the modern humor.
Fanfiction.net is also a good place to search. There are many different categories and tags. Look for the Avengers category and then search within it for the specific 'watch vines' concept. However, be aware that the quality of fanfictions can vary greatly on this site.
Characters may also react with confusion. Vines fanfiction can sometimes be very strange or abstract, especially if it combines different elements in unexpected ways. So they might scratch their heads trying to understand what's going on. For example, if it has a mash - up of different genres and timelines, it can be quite bewildering.
In this fanfiction, some Avengers might be in shock. For example, Captain America could be deeply saddened, his belief in justice and protecting the world shaken. He might feel a sense of failure for not being able to prevent the Snap.
It gives fans a chance to explore different 'what - if' scenarios. By seeing the Avengers' reactions, fans can get a deeper understanding of the characters.
Tony Stark might use his quick wit and technology. He could immediately scan Peter to make sure there's no physical danger causing the hyperventilation. Then he'd probably crack a joke to try and calm Peter down, like 'Kid, you breathe any faster and you'll fly away like a human jetpack.'
Some characters would likely be entertained. For instance, Loki might enjoy seeing the various ways fans write him as a more complex anti - hero. He'd probably find the creativity in the fanfiction quite appealing.