How do I get girlfriend to let me have threesome with her and her best friend?

Witchhaven
Her best friend so far has let me touch her ass and her leg whenever we're alone from my girlfriend. My girlfriend said she likes girls and has done a threesome before and said she would do one with her best friend but just not right now.. she said when she is secure in our relationship. She be sensing the attraction I have for her friend. I kissed her best friend on the shoulder and she sprayed water on me after... Basically.. I want to know if her best friend might like me and have feelings for me if she let's me touch her a lot and I complimented her on her appearance many times and she always blushed and said thank you. She's already in a 3way relationship with somebody but I told her she might have to try it with me and my girlfriend and she told me keep dreaming pretty much smiling.. I don't know low-key I like her more than my girlfriend. I kinda had to beg a lot for sex. I always kinda had to force her to have sex with me or pry her. It gets tiring after a while...
How do I get girlfriend to let me have threesome with her and her best friend?
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