I must admit that I have done it, too. I was already very aroused and I couldn't stand the thought of waiting those few more hours until I got home to my Master. So I went into the bathroom and got myself off.... it was quick but good!
And when I used to live 7 minutes away from work, I would run home on my half hour lunch break to get fucked or suck my Master's cock, and then have to race back to work smelling like cum.
-Vixey