Since we don't know the specific 'nerd's harem gay story', the main characters could be a diverse group. There might be the titular nerd, who perhaps is intelligent but socially awkward. And then there could be other characters in his harem, like a jock - type who is starting to see the nerd in a new light, or an artsy guy who is attracted to the nerd's unique qualities. But again, this is pure speculation without more knowledge of the story.
Since I don't know the details of this 'nerd's harem gay story', it's difficult to give a proper explanation. It could potentially be about a nerdy character who has a group of male admirers in a romantic or friendship context, but that's just speculation.
There was a gay nerd called Ben. He had a huge crush on the jock of the school, Alex. Ben would often watch Alex during sports practice. One time, Alex got injured and Ben helped him with his studies while he was recovering. Through this, they got to know each other better. Alex discovered that he was attracted to Ben's intelligence and kindness, and they became a couple.
Well, there was this jock. He was the star of the football team. And then there was a black nerd. He was super smart and into all kinds of geeky stuff. One day, they got paired up for a project. The jock was initially dismissive, but as the black nerd started explaining his brilliant ideas, the jock was impressed. They started spending more time together outside of the project, and before long, they realized they had feelings for each other. They had to deal with some of the jock's teammates who didn't understand at first, but they stuck together.
Maybe the nerd has been bullied by the jock or the jock's friends. In a moment of desperation and wrong - headed revenge, he decides to drug the jock. But his actions are completely unacceptable regardless of the motivation.
A typical story could be about a nerdy guy who is shy and into books and comics. The jock is outgoing and popular. They meet in an unexpected situation, like in detention. The nerd is helping the jock with his homework during detention. The jock starts to see the nerd in a new light and realizes he is attracted to him. Then they start to secretly date, hiding their relationship from their different friend groups at first.
Overcoming differences is a big theme. The jock and the nerd usually come from different social circles and have different interests. But in the love story, they find common ground. Also, the theme of growth is there. As they fall in love, they both grow as individuals. The jock may become more sensitive and the nerd may become more confident. And of course, the theme of love against all odds, as they have to deal with potential homophobia and the judgment of others.
It could be about the unlikely friendship that forms between a gay nerd and a druggie. Maybe the nerd tries to help the druggie get clean and in the process, they learn a lot about each other's worlds.
There was a gay nerd who worked at a tech startup. He was really into coding and video games. One day, a new guy joined the team. They bonded over a difficult coding problem they were trying to solve. As time passed, they found out they were both gay. They started going to LAN parties together and soon their friendship turned into a relationship. They would often stay up all night, playing games and sharing their dreams about future tech projects.
A story could be of two gay nerds who met at a board game convention. They were both drawn to a very complex and niche board game. As they played together, they discovered how well they complemented each other's strategies. After the convention, they exchanged numbers. They started to build a relationship around their love for board games and also their shared love for cooking. They would often cook together while waiting for new board games to arrive in the mail.