One possible fanfiction could be that Sam and Jack decide to elope to Vegas on a whim. Maybe they've been secretly in love for a long time but couldn't act on it because of military regulations. In Vegas, they find a small chapel and get married in a simple yet heartfelt ceremony. Their friends back at the SGC are shocked but also happy for them when they find out.
For this fanfiction, the Vegas wedding could be a turning point in their relationship. Before Vegas, Sam and Jack were always tiptoeing around their feelings. But in Vegas, the rules seem different. The bright lights and non - stop action of the city give them the courage to take the plunge. After the wedding, they return to the SGC with a new - found confidence in their relationship. They face some initial resistance from their superiors, but their love is strong enough to overcome any obstacles.
One great Stargate Sam and Jack fanfiction is 'Threads' which delves deep into their relationship. It shows how their connection grows over time and the challenges they face. The author does an excellent job of staying true to the characters' personalities.
I think 'Beyond the Gate' is a must - read. This story takes Jack and Sam on a mission that forces them to rely on each other more than ever. It not only shows their professional relationship but also how their personal feelings start to surface during difficult situations. The plot is engaging and the writing style is very immersive.
The chemistry between Sam and Jack in the original Stargate series is a big factor. Fans want to see more of their relationship explored, which fanfiction allows. It gives a chance to fill in the gaps that the show might have left.
A prevalent theme is the exploration of their unspoken feelings. In the show, there are a lot of glances and unsaid emotions between them, and fanfiction delves deeper into that. Also, there's the theme of sacrifice. How far would Sam or Jack go to save the other? And then there's the theme of alternate universes. Writers like to play with the idea of different realities where Sam and Jack's relationship might be different, like in a universe where the military rules don't exist.
There is also 'Hidden Feelings'. This story is really good as it focuses on the emotional side of Sam and Jack. It shows how they struggle with their feelings in the midst of their military duties. The author does a wonderful job of portraying their internal conflicts and the slow build - up of their relationship.
In this type of fanfic, Sam and Jack could be on a mission near Washington during Christmas. They might encounter some strange Stargate phenomena that are affected by the holiday spirit in some way. For example, the Stargate could start acting up and sending out strange signals that they have to figure out. This could lead to a series of adventures that are both Christmas - centric and related to the Stargate universe.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There's a large collection of Stargate SG1 fanfictions there, and you can easily search for ones specifically focused on Sam and Jack. Another option is FanFiction.net, which also has a good number of stories in this category.
One possible plot could be that Sam and Jack are in Washington for Christmas leave. However, they get called back to the Stargate base when an unexpected energy surge is detected near the Stargate. As they investigate, they find that the surge is related to an ancient Christmas - like celebration on a far - off planet that is somehow connected to Earth's Christmas through the Stargate network.