"Talk dirty to me"

So today during sex my bf asked me to talk dirty to him and i didn't know what to say!! I've never done it before 🙊🙊😂😂 it was embarrassing. All I could think of was "you feel so good inside me" and "your arms are so nice" PLS HELP ME. Neither of us like to be vulgar or cuss during sex so what can I say to sound sexy??