I'm not sure specifically about a fanfic with that exact title. There are a lot of 'Killua x Gon' fanfics out there in the Hunter x Hunter fandom, but to find one with such a strange title would require some in - depth searching through fanfic platforms.
In 'killua x gon fanfic', the theme of sacrifice often appears. Killua or Gon might sacrifice something for the other's well - being. Another common theme is the power of their bond. It's often shown as something that can overcome great obstacles. And there's also the theme of shared dreams. They both have goals as hunters, and fanfics may explore how they pursue these dreams together or support each other in achieving them.
Gon in fanfiction can be very single - minded in his pursuit of goals, just like in the original. He might be a bit more naive at times, which can lead to interesting plot twists. Killua is often portrayed as having a complex emotional side. He struggles with his past as an assassin and his loyalty to Gon. His cool exterior may crack in some fanfictions, showing his true feelings.
Well, for one, it's the development of their relationship. In a mature fanfic, we see them handling complex emotions. For example, they might face jealousy in a more grown - up way, not just the simple envy a child would feel. Their bond becomes more about mutual respect and understanding.
I haven't come across a 'Giant Dick Killua x Gon Fanfic'. Fanfics usually range from various genres like adventure, friendship - enhancing, or alternate universe stories. A title like this seems rather out of the ordinary and not in line with the general positive and respectful nature of most fan - created works. So, it's likely not a common or widely available one.
The common themes include the growth of their relationship. Starting from their initial acquaintance in the series, fanfics show how their relationship evolves into a romantic one. Trust is another big theme. They have to trust each other not only as friends but also as lovers. And many fanfics also touch on the theme of sacrifice. They might be willing to sacrifice for each other's happiness in a more romantic - relationship - based scenario, which is an extension of the selfless friendship they had in the original anime.
In 'killua x gon fanfiction', one characteristic is the exploration of their relationship in different scenarios. It could be in alternate universes where they face new challenges. Also, their friendship is often romanticized to some extent, with the authors delving into the unspoken feelings they might have for each other. Moreover, the fictions usually stay true to their personalities as shown in the original anime, while adding new layers to them.
Often, they show a deeper level of commitment. The mpreg forces them to rely on each other more. For example, Gon might become more protective of Killua during the pregnancy.
Well, if we consider the context, it might be an AU (alternate universe) fanfic. Maybe in this version, 'large balls' could be a metaphor for courage or some kind of power that Killua and Gon possess. It could also be a really out - there, absurdist story that plays with the characters' personalities and the concept of 'large balls' in a completely unexpected way. For example, it could be related to a strange adventure where this 'large balls' thing becomes a key element in their journey together, affecting how they interact with each other and the world around them.
Some Tumblr blogs also post and recommend 'killua x gon love fanfic'. You can search for relevant tags or follow blogs that are dedicated to the 'Hunter x Hunter' fandom. They often share links to interesting fanfics.