I bit my lip a little because by now I was far more turned on than I had been early this morning. She slid my pants down to my ankles and pushed the chair that I was sitting into my desk and she slid under the desk. This has never happened to me before, usually, I was the one in charge, but I didn't mind this switch-up. She pulled my underwear down a bit to expose my clit which was already seeable and enlarged from being turned on. She began to rub my clit with her finger. I let out a soft moan, a moan of delight, of pleasure. She switched her finger to her tongue which made me grab the arms of my chair. I was close and she knew it. Her tongue worked for circles around and around. Slowly work up to the orgasm then quicken the pace. I heard a knock on the door, which was unexpected because I usually don't get any intrusions during my sessions. I jumped and tried to compose myself, but It was too late for that. Whoever was at the door was coming in. I told my patient to stay where she was which she didn't mind because she wanted to get me off. The door opened and it was my receptionist. She was telling me about the paperwork that had to be signed, but I wasn't paying attention because as she was talking, my patient under the table was tracing slow circles around my clit. I tried to push her away but she was insistent. It took everything I could to not let out a moan. After the receptionist was done talking I said "I will get those signed before I leave today". As soon as the door closed, I let out a moan of pleasure as her tongue went back to the same velocity as before. Before I knew it I was shuddering and shaking as a huge release overcame my body. After I regain where I was, she came out from under the desk and kissed me on my lips, and said "glad to be of service, doctor". "See you next week".