A hot short about a student who needs some help in passing his history class. He goes to the professor because he's heard rumors that he could prostitute himself for a grade, but that's not really the deal. The deal is that he has to study, on his own like he normally would, and then the professor will ask questions, and if he doesn't get them right, he's punished. After the first session he thinks the whole situation is BS and quits, but he comes back fairly quickly, and then more often, and then he realizes that the stakes are much different than he thought they were in the beginning because he's grown to crave their time together. 
 So, this hits my student/teacher kink in all the right ways. If you enjoy that dynamic with some light S&M thrown in, this story is awesome. I just wish there was more. =)