One possibility could be that in the fanfic, Android 18 sees Gohan's kind heart and strength. She might start to develop feelings for him as she watches him protect the Earth. Their relationship could be an interesting mix of her android nature and his Saiyan - human hybrid nature.
A possible plot is that Android 21, who has some glitches in her system related to her emotions, is healed by Gohan's kindness. As a result, she starts to develop feelings for him. They then have to deal with the fact that their relationship is not accepted by some in the Z - Fighter community because of Android 21's origin. This leads to a story full of drama and self - discovery for both of them.
Their relationship can develop through mutual respect. Gohan respects Android 21's strength and intelligence, while Android 21 respects Gohan's kind heart. This respect can turn into friendship first. For example, they train together, learning from each other's fighting styles. Then, as they spend more time together, they start to notice little things about each other that they like, which gradually leads to a romantic relationship.
Their relationship could be developed realistically by having them work towards a common goal. For example, they might be trying to stop a new villain from taking over the world. As they plan and execute their strategies, they see the best and worst in each other. Gohan might see Android 18's determination even in the face of great danger, and Android 18 might see Gohan's selflessness. These experiences can bring them closer and form a relationship based on trust and admiration.
Maybe in the fanfiction, Android 18 gets injured while protecting Gohan from a new powerful enemy. Gohan then takes care of her and in that time of vulnerability, they realize their feelings for each other. This could lead to them exploring a relationship while also trying to figure out how to defeat the enemy that still lurks.
For Gohan, his character could be developed by showing his struggle to balance his family life with his new relationship with Android 18. He might be hesitant at first because of his responsibilities. For Android 18, her character could be developed by exploring her emotions more deeply. Since she was an android originally, she could learn about love and friendship in a new way through her relationship with Gohan.
Well, a common plot might be that Gohan discovers a new side of Android 18. Maybe she has a hidden talent for cooking or art, and Gohan is really intrigued by this. They could start spending more time together exploring her newfound interests. Or perhaps there's a plot where an old enemy returns, and Gohan and Android 18 are the only ones who can stop it. In the process, they realize their feelings for each other are stronger than they thought. Another one could be a story where Android 18 is having trouble adjusting to life among the Z - fighters, and Gohan helps her fit in, which leads to a romantic relationship.
It depends on the specific fanfic. There are a vast number of Dragon Ball fanfics out there, and while some may choose to have Android 17 be Gohan's teacher, others might not. Some fanfics focus more on the battle aspects, while others explore different character interactions. So, you really have to search through different fanfics to find ones where this is the case.
A fanfic with Android 18, Gohan and lemon could be centered around a mystery. Maybe there's a lemon - scented object that has some sort of power or significance. Android 18 and Gohan team up to figure out what it is. It could lead to them exploring new places and getting to know each other better.
A fanfic involving Android 18 and Gohan with a 'lemon' aspect could be really interesting. It might explore a unique relationship between them. Maybe it could be a story where Android 18, with her complex character, has some sort of adventure or emotional journey with Gohan. The 'lemon' part, if not in an inappropriate way, could symbolize something fresh or tangy in their relationship, like a new start or a different kind of bond.