When a pleasure slave has pleased me, a nice reward is to allow his lips and tongue to pleasure my feet. They are very sensitive and when the foot licking is done properly, I feel my entire body respond to it. There is a special spot right in the middle of my foot, just below the ball, that feels like it is connected directly to my clit. I discovered this by accident, I once had a girlfriend of mine come over to watch the movie Secretary. As we sat side by side on the couch, we thought it would be relaxing to massage each others feet while watching the video. I noticed that she would shudder and gasp when I rubbed that special spot on her foot. It responded to very light feathery touches and also to deep pressure from my thumb. She did the same thing to my foot and we had this amazing back and forth pleasure circuit created by the sensations we each felt and simultaneously gave each other. We didn't say a word, we just kept watching the movie, pleasuring each other in this way. I would hear her breathing change and soft little moans escape her lips, then I would change what I was doing lest she cum too soon. She would get the same responses out of me. We teased each other like this for a long time, absently watching the movie. Every so often, she would fall over the brink and have a nice little tremble as her pussy clenched. I don't know how many times we rode that orgasmic wave together, but I do remember how great it felt to discover yet another erotic response we are capable of.