There are some xcom crossover fanfiction with the Fallout series. In these stories, XCOM soldiers find themselves in the post - apocalyptic wasteland of Fallout. They often bring their advanced technology and combat training, which causes quite a stir among the locals. Some of these fictions focus on how XCOM tries to restore order in the chaotic Fallout world.
One popular xcom crossover fanfiction is the one where XCOM agents cross over with the Mass Effect universe. It's really interesting to see how the XCOM combat strategies are applied in the fight against the Reapers. Another great one is the crossover with the Warhammer 40K universe. The grimdark setting of 40K and the high - tech nature of XCOM create a really unique blend.
The xcom crossover fanfiction with the Star Wars universe is also quite engaging. Picture XCOM soldiers facing off against the Sith and the Jedi. The use of blasters in XCOM and lightsabers in Star Wars makes for some epic battle scenes. The different cultures and technologies from both universes are explored in depth in these fanfictions.
One idea could be a crossover with the Mass Effect universe. The Xcom soldiers could encounter some of the alien races from Mass Effect and have to work together or face off against them. Maybe the Xcom team has to deal with the Reapers in some way.
Some great xcom fanfic stories include 'XCOM: Shadows of the Past'. This one might explore the backstories of some of the main characters in the XCOM universe. There's also 'XCOM: Future Horizons' which takes the story into a more futuristic setting with new threats and challenges. Additionally, 'XCOM: The Underground' could be a cool fanfic that focuses on a secret underground movement within the XCOM world.
I really like 'XCOM in the Star Wars Galaxy'. It's a fun crossover where the XCOM troops are dropped into the Star Wars universe. They use their high - tech weaponry and tactics against the Sith and the Empire. It has some great battle scenes where XCOM's stealth technology clashes with the Force - using Sith Lords. Also, 'XCOM and Halo: The United Front' is quite good. The XCOM soldiers and the Spartans join forces to combat an alien invasion that is more powerful than either has faced before.
You could also focus on the technology aspect. Templars are used to a certain level of technology in their world. How do they react to Xcom's advanced weaponry and high - tech facilities? Do they see it as a means to enhance their own abilities, or are they skeptical? This exploration of the relationship between different technological levels can add depth to the fanfiction.
One popular trope is the relationship between a soldier and their commander. It adds an element of forbidden love or a power dynamic. For example, a rookie falling in love with the battle - hardened commander.
One popular theme is the relationship between soldiers in XCOM 2. Writers often explore the deep bonds that can form during combat and how those can turn into love. For example, a story might focus on two soldiers who start off as comrades but gradually fall in love as they face the challenges of fighting the aliens together.
Another aspect could be the exploration of the political and cultural differences between the two universes. XCOM is mainly focused on Earth defense, while Mass Effect has a complex galactic political system. A fanfiction could explore how the two groups interact when it comes to things like trade, alliances, and dealing with common threats. For instance, how would the XCOM Council (if there was one in the crossover) deal with the Citadel Council's decisions and vice versa?
One interesting Xcom fanfiction could be about the soldiers' personal lives off - the - battlefield. For example, how they deal with post - combat stress and form relationships within the base. Another might be a story that reimagines the Xcom project from the perspective of an alien who has been captured and is trying to understand the humans' motives. There could also be a fanfiction where a new recruit has some sort of special power or ability that changes the dynamics of the Xcom team's missions.
Many XCOM 2 fanfictions explore alternate endings or scenarios. They might imagine what would happen if certain key battles were lost or if new alliances were formed. This gives readers a chance to see different possibilities within the XCOM 2 universe.
I'm not entirely sure which specific 'xcom lemon fanfics' are popular. Fanfics can vary greatly in popularity depending on different fan communities. You could try looking on fanfiction websites like Archive of Our Own and search for 'xcom' to find some, but be aware that 'lemon' often implies mature or adult - themed content which might not be suitable for all audiences.