People forget Gohan's whole childhood was basically being Goku's backup plan for fighting. The 'Gohan x Goku' tag always feels way less about romance to me and way more about exploring the sheer, brutal absence that defines them. It's father-and-son, but filtered through a weird sci-fi family trauma where the dad dies, comes back alien-possessed, dies again, and the kid has to save the world while holding a photo of a guy he barely knows. Those fics dig into the quiet moments that 'Dragon Ball Z' skipped—like, what does Gohan even say to him after Cell? How do you have a barbecue with a guy who chose to stay dead?
I read one once that was just them fixing a roof. No fighting, no big speeches. Goku doesn't understand why a leak matters, and Gohan gets quietly, furiously adult about it. That dynamic—the son who had to grow up versus the father who's eternally a child—gets stretched into these intense, sometimes uncomfortable, studies of obligation and love. The pairing, for the writers who go there, seems like a tool to examine that specific, broken bond until it bleeds.