I want him to speak to me in Spanish

Ok so my boyfriend is bilingual. His first langue is English but he can also speak Spanish perfect most people believe he is a native speaker. So problem is after watching a movie with a sex scene were girls boyfriend spoke to her in Spanish burning the act. I kind got turned on by it and want see if we can do it to but he won't even try. I begged him to just try it he straight up just said no. I don't understand why we can't. I have done things he wanted me do in the past I even dressed up like cat women because he thought she looked hot in batman. I tried to just let go but I just can't stop thinking about So do any advice on how to get him to just try it with me :)

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