What should I have said to him?

This guy I used to be friends with and go out with has started texting with me again. I posted something and then he asked if he could “taste me”, he definitely meant eating me out. I didn’t reply for 12 hours cause I didn’t know what to say and ended up just sending a wink face emoji. I really like him but him saying that was a little to fast for me. I wanted to show my interest but not come off as a easy girl etc. My question is, what should I have said?
What should I have said to him?
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