My last year of college I was pretty desperate to raise my GPA so I could get into medical school and there was one class that I was struggling in because everything was just way over my head. I was thinking of how I could persuade the teacher to help me out so that I'd get a good grade in class so I went to his office one Friday afternoon. He was about to leave when I knocked on his door. He told me to come in and have a seat and tell me what was wrong etc. So I began to tell him of my situation and he was very understanding and at the end of my plea I told him I would do anything to get a good grade in his class. I noticed that he was rubbing his crotch and nodding his head and I got the hint but I wasn't gay and had a girlfriend at the time so I stuttered and didn't know what to say and he just told me to go along with it. He got up and locked his door and shut off the light and leaned on his desk in front of me and grabbed my hand and placed it on his cock. I was surprised to see such a small man could have such a large cock, I mean my cock was 9 inches but his was thicker and a bit longer. I couldn't believe my eyes when he pulled it out and prodded my face with it. I could barely get half of it in my mouth before he told me to bend over the desk. This was my first time ever having anal sex with a guy and it hurt but he was gentle. This started to become a regular thing and we would have sex in random places around campus. One weekend he told me to come by his house so I showed up in the middle of the night and walked into the living room where he was sitting by the fireplace completely naked but someone that could have been the age of his daughter was sucking his cock. I was immediately turned on and I began to lick her pussy from behind and eventually stuck my cock in her pussy and fucked her till she came at least 5 times on my cock. While this was going on my professor would alternate between fucking my face and fucking hers and eventually he entered her pussy with me and we double penetrated her for what seemed like and hour. We both came powerfully into her and then all three of us collapsed. At the end of the night I went back to my girlfriends place and we fucked like animals. I got an A in the class.