I like the idea of having a drink first, particularly since this is your first time. I'm sure as colleagues you have some things to talk about. Moreover, it's always good to break the ice. Flirt a little, have some buildup. Hot. I've had some casual sex in my day, and it helps for me to have some sort of rapport with the person--I'm not a fan of strictly prurient relationships.
If that doesn't work for you, then I'm gonna second Hyacinthe's suggestion of just grab him and kiss him when he walks in the front door. In one of the few strictly prurient relationships I have had, that's pretty much how it went down. As soon as the door was shut, he was on me like white on rice. It was hot in its own right.
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"With all its sham, drudgery, and broken dreams,
it is still a beautiful world.
Be cheerful. Strive to be happy."
-Desiderata
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