First, you should know what when I make it with my man, I cum hard and I cum loud. I thrash, I scream and I generally make a big ol' fuckin' fool of myself.
When I'm at work though, and when I'm thinking about those sex sessions, I get to where I have an itch in my beaver that just has to be scratched. Then, I know things have to be a little different.
I work in a semi-secluded cubicle, and everybody else minds their own business, so that's cool.
What I like to do, when I can't hold off anymore, is loosen my belt a little, slip my hand down to my cooze, and, with my middle finger, start slowly, slowly, slowly rubbing my clit in a circular way. I know I can't go fast, and I know I can't go hard, or I'll get carried away. So I just keep going, slowly and methodically, feeling the pressure build, until I can't wait anymore, and I pop a climax that, in some ways, is even stronger than it would be otherwise because I have to hold it all in.
I also keep a box of wipes handy to to clean off my finger-and my slit, because it gets so wet.