Should I go back for more after ONS?

Basically last night I ended up going back with a (very hot!) guy, he asked for my number and said he'd text me today but I got nothing (though who knows, he may have typed in my number wrong since we were in the middle of the club at the time..) and I never thought to ask for his number. While we were *ahem* doing the deed there was lots of talk of me coming back for more! (from him too I hasten to add) I've found him on facebook, I'm not silly enough to add him but is it worth sending him a message in a day or so instigating that we should hook up? All I want is a booty call and that's all he'd be up for too so we're good there! He said he goes away for 4 weeks in a couple of weeks and incidentally I do too. I guess the worst that can happen is he ignores the message or says no! If you were the guy what would you think?

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