One plot idea could be that in a world where Sakura is male, he and Naruto are on a mission together and get trapped in a cave. During their time there, they start to open up about their insecurities and feelings for each other, leading to a deeper bond. Another could be that male Sakura is a medic nin who has to take care of an injured Naruto after a battle. As he nurses Naruto back to health, they realize their feelings have changed. A third idea is that they are both entered in a ninja tournament and as they compete against others and support each other, a romantic relationship begins to form.
Well, a possible plot for male Sakura x Naruto yaoi fanfiction is that they are both sent on a diplomatic mission to another village. Along the way, they face many challenges and have to rely on each other. In the process, they discover that their partnership has a deeper meaning. Also, perhaps male Sakura has a secret ability that he has been hiding and Naruto accidentally discovers it. This leads to a series of events where they grow closer. And then there could be a plot where Naruto gets cursed and male Sakura has to find a way to break the curse, during which their relationship evolves.
In a male Sakura x Naruto yaoi fanfiction, a great plot idea could be that they are training partners from a young age. As they grow up, their relationship changes from just friends to something more. Male Sakura might be jealous of how much attention Naruto gets from others, which could lead to some conflict and then resolution as they realize their feelings for each other. Another idea is that they are part of a special ninja unit together. In this unit, they are constantly put in dangerous situations where they have to protect each other. This constant life - and - death situation makes them realize their love for one another. Also, it could be that male Sakura is from a different clan and there are some clan politics involved that affect their relationship, but they still manage to be together in the end.