Why did wife say this??

Hi we were in bed the other night and she loves me to tell her dirty stories, I let her pick the topic and she said tell me about big black dicks.. I was shocked, I felt her and she was so wet. Why did she pick that topic, I never thought she would have said that!!!!
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Is this more BS?

You have been talking about black cock and your wife for the past several years.
Cuck who loves a creampie.

exactly, she's trying to ease you into what she is up to.

i think your getting to her. my wife has gone thru a similar metamorphasis - when i first asked her to cuckold me about 8 years ago - she said no way - it will never happen. well today she really enjoys role playing the fantasy with me that some other guy is fucking her - and she is good at it too. she has learned what to say to make me come - like - oh tyrone your cock is so much bigger than my husbands but please done come inside me you will make me pregnant. and it goes on and on like that till i spurt all over her titties while i fuck her pussy with a thick black dildo.