delia and Dragon's muse well said to both of you and I bet you keep your Masters proud.
Task that you can do to keep him in your mind and your submissive well oiled, try this one take a metal clip, one that would clip chains together, with you to work. Each time you go to the bathroom, each break you take you go into the stall and use the clip on your sweet clit for a set number of strokes, this can be added to by sucking on fingers while thinking of sucking on his cock.
One I love is having her wear a garterbelt with ribbons hanging down the front to tickle and tease her clit and inner thighs as she moves even a little