One possible fanfic could be about the adventures they go on during a battle. The Heavy could be using his minigun to mow down enemies while the Medic heals him. Their relationship is a unique bond of trust and reliance. For example, in a mission where they are outnumbered, the Medic's quick thinking and the Heavy's brute force could lead them to victory against all odds.
Another great one is 'Heavy's Duty and Medic's Cares'. In this fanfic, the story might revolve around a particular mission where Heavy gets injured. Medic's determination to save him and the emotional connection that develops during the process is the central theme.
Friendship is also a big theme. Their relationship is usually shown as a deep friendship that might border on something more. They understand each other in ways that other team members might not. In some fanfictions, they are the only ones who can comfort each other after a tough battle or a difficult event at the base.
A great aspect is the relationship building. It should show how they start from just being comrades in arms to having a deeper connection. This could involve shared experiences in battles, like Heavy protecting Medic while Medic heals him at crucial moments. It also might explore their different cultural backgrounds and how they influence their relationship. Moreover, the plot should be engaging, perhaps involving some sort of conflict or mystery within their relationship or in the game world they are in. Maybe there's a new enemy that specifically targets their bond, and they have to fight against it together.
A fanfic could be set in a post - apocalyptic world where the TF2 characters are the last line of defense against some new, powerful threat. The Heavy and Medic have to work together to develop new strategies and weapons. Their relationship is put to the test as they face difficult decisions and moral dilemmas.
Protection is also a theme. Heavy might protect Medic from physical threats, while Medic protects Heavy in a more medical sense, making sure he stays healthy and fit for combat. There are fanfics that revolve around these aspects of their relationship.
One great 'heavy x medic fanfiction' is 'The Unlikely Bond'. It beautifully portrays the unique relationship between Heavy and Medic. It shows how they rely on each other in the chaotic world of their story. Another one is 'Partners in Healing' which focuses on their cooperation not just in battles but also in taking care of their comrades.
In heavy x medic fanfiction, a frequent theme is the exploration of their different personalities. Heavy's stoicism and Medic's eccentricity play off each other. There's also the theme of trust. They have to trust each other in dangerous situations. For example, in many stories, Heavy trusts Medic completely with his life during combat situations. And cooperation is another theme, as they work together in their team.
In the TF2 lore, they have a lot of shared experiences. They've been through many battles together. Fanfiction writers can build on these shared experiences and create backstories or future scenarios. For instance, a fanfic could be about a time when Heavy was severely injured and how that affected their relationship. Or it could be about their adventures outside of the regular battles, like exploring a strange new area in the TF2 world. There are countless possibilities to explore their bond and the unique aspects of their individual characters in fanfiction.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are often many talented writers in the TF2 fandom who create great stories about Heavy and Medic. Another option is to check out some TF2 - focused forums where fans might share their fanfictions or recommend ones they've read.