Dirty talk during sex

Okokok so i need help. My boyfriend is a fucking god at sex. And he talks dirty to me while we’re going at it. And like, i freeze up. I’ve never been able to dirty talk. My mind just goes blank. He’s always asking me to talk to him and like i just end up saying “oh fuck” “you feel so good” or “harder”. He always says things like “you’re so fucking tight” or “you like it when daddy fucks you?” I NEED EXAMPLES TO WHAT I CAN SAY