My guy friend joked about us hooking up?

Margo7
Okay, so the topic of fireworks came up in conversation the other day when I was with a group of friends. And suddenly my guy friend goes "Psst!" to get my attention. I turn and he says really subtly, "you and I are gonna make the fireworks" (like, obviously this was meant as a euphemism, you could tell by the way he said it).

It was weird to hear him make that joke, especially since previous times people have made jokes about him and me hooking up, he has denied it (it's happened at least twice before, once when someone joked about him eating me out, and once when the subject was just a general hook up) in saying something along the lines of "Oh, Margo and I don't have that kind of relationship" and then added in a joke to make light of the situation.

And we have agreed that our friendship is strictly platonic, and that we wouldn't date each other ever. So it feels really awkward that he made this joke about him and me having sex when we have agreed our friendship isn't like that.

So should I think nothing of it?
My guy friend joked about us hooking up?
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