My 23-year-old white boyfriend keeps asking me, a 18-year-old female, to use the N-word.

We've been dating for almost a year, and I really hadn't seen any red flags until last night. During an intimate moment, he unexpectedly asked me to say the n-word, despite knowing that I'm completely against that kind of language. He kept pushing me to say it, and now I'm wondering if this is related to a kink?