The raciest thing at my works do was the vol-au-vents, they had prawns in marie rose sauce with chilli.
But I remember lots of outdoor shagging with inappropriate partners in my Bridget Jones years. Bloody great it was.
He should say something if he's any kind of gentleman, but not try and perv you up for a second go. As the main boss, he should find a way to put you at your ease, as it were!