I want to have a threesome with my girlfriend and another girl - what should I do?

Anonymous
Me and my girlfriend have being going out for 3 1/2 years we are a very sexual couple and talk about everything.

she tells me she would love to be with another girl

but when ever a I ask her for a threesome she says no.

I guess she is jealous of me being with another girl..

is there a way of doing this without her being jealous of the other girl and how could we even get another girl to be on this adventure
I want to have a threesome with my girlfriend and another girl - what should I do?
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