I'm not entirely sure which specific 'piccolo x gohan lemon fanfic' you're referring to. But generally, if it's a fan - made story, it might explore unique relationships and character developments. It could potentially show how Piccolo and Gohan interact in a different way than in the original series, perhaps delving into their friendship or a more complex emotional bond.
One common theme is friendship. The fanfics might explore how the reader character becomes friends with Piccolo, gradually breaking through his tough exterior.
One popular Piccolo and Chichi fanfiction is 'A New Bond'. It explores an unexpected friendship between them as they train together to face a new threat in the Dragon Ball universe.
One possible theme could be friendship. Given that Piccolo and Gohan have a long - standing relationship in the Dragon Ball series, the fanfic could further explore the depths of their friendship, how they support each other through different challenges.
One interesting plot idea could be that Piccolo and Chichi team up to protect the Earth from a new and powerful threat. They have to put aside their differences and use their unique skills. Piccolo's combat and strategic abilities combined with Chichi's strong will and motherly instincts make for an interesting dynamic.
You can try searching on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics in various categories, including piccolo x reader ones.