Perhaps Sam overheard a conversation between Dean and another supernatural being. Or maybe there was a vision or dream that revealed the truth to him.
Well, Sam could be like a protective uncle. He might teach her things about hunting that Dean doesn't want her to know yet. Their relationship could also be a bit strained at times. Since Sam has his own ideas about how she should be raised in the hunting world, which might not always match with Dean's.
One place to look for such fanfiction could be Archive of Our Own (AO3). It has a vast collection of Supernatural fanfictions, and by using the search function with relevant tags like 'Dean', 'Sam', and 'kiss', you might be able to find the fanfictions you're interested in.
It depends on who you ask in the Supernatural fandom. Some people are very against the idea of Sam and Dean making out in fanfiction. They believe it ruins the pure brotherly relationship that has been built up over the series. Others might be more open - minded and see it as just another form of creative writing within the fanfiction community. But generally, it's not something that is considered in line with the main themes and relationships of the show. So, while it might have its small group of supporters, it's not a widely accepted concept in the larger Supernatural fandom.
In a fanfiction, their sister could be a prophet. She starts having visions that lead the boys to new cases. But there are forces that want to use her for their own gain. Sam and Dean would have to fight not only the regular demons and ghosts but also those who are after their sister.
Dean would probably be very protective. He's always been the big brother looking out for Sam, and with Sam as a kid, that instinct would be even stronger. He'd be constantly worried about Sam getting hurt and would keep him close at all times.
Often, it could be that other characters who knew tell Sirius. Maybe it's a mutual friend or a family member. This way, Sirius gets the tragic news.
Well, in these types of fanfictions, a common theme is often the struggle between their brotherly bond and this new romantic or sexual relationship. There's also the theme of secrecy, as they would have to keep this new relationship hidden from others in the Supernatural world. Additionally, some fanfictions might have a theme of redemption or acceptance. Maybe they initially feel guilty about their new relationship but then come to accept it. And sometimes, there's a theme of power dynamics, as they both have different personalities and abilities, and this new relationship could change how they interact in terms of power and control.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of 'Supernatural' fanfictions, including those involving female versions of Sam and Dean. Just use the search function on the site and type in relevant keywords.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a vast collection of Supernatural fanfictions, including those with a gay theme involving Sam and Dean. Just use the search function and type in relevant keywords.
Fanfiction.net also has a good number of such stories. Just use the search function and type in 'Supernatural Sam and Dean romance' and you'll get a bunch of results.