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The reader only needs to be told how "G" sounds once. You can put the explanation in-story, e.g. the character says or thinks 'I hate it when Bob calls me G, I can just hear him thinking "Gee whiz"...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/46922 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46922 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The reader only needs to be told how "G" sounds once. You can put the explanation in-story, e.g. the character says or thinks 'I _hate_ it when Bob calls me G, I can just hear him thinking "Gee whiz" whenever he does it' (this example is imperfect, you want to make the explanation completely unambiguous, but I think you get my point here). From then on, you can simply write G and everything is clear.