How to ask a guy to hookup again?

I hooked up with a guy I meet online. When it was over he told me to text him whenever. I wanna hookup again this weekend or real soon (it’s been 5 days). I don’t know how to start the text. Should I say hey then ask him if he’s busy or start a conversation (we only ever sext)?

How to ask a guy to hookup again?
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