What should I say when he is fucking me?

my boyfriend just text me saying how much he enjoyed what we did yesterday (ill leave that for you to guess) and said what i was saying really turned him on as it was the first time i had really said anything during sex but i was just wondering anything i could say next time? i have said things like 'you feel so big' 'fuck me harder' and 'that feels amazing'andstuff like that but i was wondering if there was anything else you might want to hear your girl saying to you?
What should I say when he is fucking me?
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