when we get on the topic of sex/kinks far before anything happens i always just straight up say it, like 'i have a big daddy kink, how do you feel about that?' my current partner never tried it before but was open to it and got converted ehehehe. if you're nervous about being judged (since there's a stigma to it), you can bring it up more as a joke like 'everyone's calling [character/meme] daddy, do you think he is?' and see what their reaction is

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