Sorry what? She does ot want to have oral sex because of the colour of your penis? Dude, maybe she just does not want it – so that’s ok right? As for colour, well sorry, its not as if anyone can change the coulr of their skin… especially genitals which are as is darker.
So well, bad luck on the oral sex and tell her to chill o n the colour issue. Read this
https://lovematters.in/en/resource/penis
Sorry what? She does ot want