You can start by looking on fanfiction.net. It has a large collection of Stranger Things fanfiction, and there are likely quite a few that involve Steve Harrington being sick. Just use the search bar and type in 'Steve Harrington sick' and you should get some results.
One great Steve Harrington sick fanfiction is 'When Steve Took Ill'. It shows how his friends rally around him when he suddenly gets a bad fever. It's really heartwarming to see Dustin especially taking care of him, bringing him soup and making sure he takes his medicine.
I highly recommend 'The Adventures of Steve Harrington'. It's a fanfiction that takes Steve on a wild journey outside of Hawkins. He gets to experience different cultures and meet all kinds of people. It's a really fun read as it shows a different side of Steve that we don't often see in the show. There's also 'Steve Harrington's Hidden Talents' which uncovers some really cool skills that Steve has been hiding all along.
The most recent Honor Harrington novel that I'm aware of is 'Mission of Honor'. It continues the epic space opera saga. In this novel, we see more of Honor's adventures, her leadership skills being put to the test in the complex and dangerous political and military situations in the Honorverse. There are new characters introduced, and the relationships between the existing characters also evolve, making for an engaging read for fans of the series.
His powers might make his friends look at him in a different light. They could be in awe of him or even a bit scared at first. For instance, if he has super strength, they might be cautious not to make him angry.
One place to find Steve Harrington fanfiction is Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can easily search for Steve Harrington - related stories. There are filters to help you sort by rating, length, and genre. Another option is FanFiction.net. It has been around for a long time and has a good number of Steve Harrington fanfictions as well.
Sure. Tumblr is another place where you might find Steve Harrington pregnant fanfiction. There are often fanfic recs (recommendations) on Tumblr blogs dedicated to Stranger Things. These can lead you to some great stories. Just be aware that Tumblr's search function can be a bit tricky sometimes, so you might have to dig a bit deeper to find exactly what you want.
One great 'Steve Harrington Angst Fanfic' is 'The Weight of the World' on Archive of Our Own. It really delves into Steve's insecurities after all he's been through in the Stranger Things universe. The author does an amazing job of showing his internal struggles.