Convincing girlfriend to try it with another girl

Hi.

I find wife sharing and cuckold videos unbelievably sexy and emotional but never wanted to share my girl with another man.

However recently I started thinking about sharing my girl with another woman. Thinking about another girl eating her pretty pussy while I touch and kiss my girl is so hot I don't know what to do. I'm not sure if she'd be into it since she has never tried anything with another girl.

Has anyone tried it? How do I bring this up or convince her?
 
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