That's a difficult question. Last week a friend of my visit us. Later that night we were becoming horny and without any notification I saw my friend was fingering my gf when I just went away. I know my gf was horny because he had a thick cock. So I said: fuck her.
But, to be sure in future, I said to my girl to say a code if we both want to fuck in a mmf threesome.
So, I would like to advise to use a codeword.
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