It was my last year at college and I was having difficulty with one of my courses. It was a mandatory course and if I didn't pass I would need to retake the course next semester which would not only extend my last year of college but also delay getting my degree and graduate. My teacher was willing to help me and offered to tutor me after hours. We did about an hours worth of tutoring a couple of days of week in his office. After a couple of weeks he mentioned I needed more hours of tutoring and suggested the only way he could fit me in was if I wanted to come by his place on weekends. I thought it was a little out of the ordinary but knew I needed to pass the course so I agreed. He had a nice place and even had a pool. He suggested we relax before we begin studying and said we should go for a swim. I told him I would like to but didn't have a swimsuit. He said it wasn't a problem and brought me up to his bedroom. We got there and he began to undress and told me to do the same. He was nude before me and stood waiting for me to be the same. He told me to go with him and I expected him to take me to another room where he would loan me a swimsuit but instead he took me down to the pool. He jumped in and told me to do the same. I did as he asked and now knew would we were going to be swimming nude. I felt a little uncomfortable at first but soon realized there was nothing wrong with it. After a good swim we sat on a couple of lounge chairs nude which was making me a little uncomfortable because he was giving me some strange looks. I asked about studying and he told me we would get to that soon enough and to relax. After a little while he told me that there was a way to pass the course with very little effort if I was willing. I told him anything to pass the course but wasn't prepared with what he wanted. He wanted me to suck his cock. I told him I wasn't willing to, so he told me he hopes I was prepared to not graduate this year. He then explains that there is only a few weeks before the exam and if we have some fun up until then he would guarantee I would pass. I wasn't gay and wasn't interested in sex with guys but figured it was going to be short term pain for long term gain so I agreed. I began to suck him but that was basically just to get himself hard. He told me to get on all fours and I basically knew what was going to happen. I just kept thinking it was going to get me to pass his course. For the next few weeks it was him and me engaging in sexual activities. Sometimes at his place, sometimes at school and always more that once a day. My ass was sore most of the time and the back of my throat was sore and raw with him shoving it in as far as he he could. I gagged most times and almost choked when he blew his load in my mouth once. The day before the exam he wanted to photograph me nude and video me doing some things. I refused so he told me "the passing the course deal" was off. I reconsidered and did what he wanted. He had me masturbate and then suck him off. He was smart enough to not get his face in the photos or videos. Exam day came and went and I passed his course and graduated. He also told me I was too good looking to just keep to himself so he put the photos and video online at a gay site. I got them to take them down and he wasn't pleased. He then contacted me and gave me another sites he just posted them to and told me if those come down he will post them on every site he could but wouldn't tell which ones and suggested I just leave them there. I decided to just live with it and accept it.