I have taught 11th and 12th grade geography for about 8 years, long enough to know my job pretty well but still young enough so that the adventurous female students will flirt with me on occasion. Of course this usually occurs around the time of an exam as a failing student tries to rescue her grade. Therefore I was not shocked (although pleasantly surprised) to see Julie float into the classroom that afternoon wearing a tight white tank top and a black miniskirt. I quickly calculated that she must have gone home after school to change and returned to talk to me, because I definitely would have noticed if she was wearing that outfit in class earlier in the day. I tried not to stare at her erect nipples as she approached me. I hoped she could not see the quickly forming tent in my khakis. She suddenly broke my daze... "I missed the midterm exam and was hoping I could make it up?" She looked up with an optimistic, pleading smile that almost made me grab her right then. Her vulnerability was seeping out and I instantly ate it up. "Well according to the attendance sheet, you are unexcused, so I really can't allow that," I replied with a regretful frown. A look of horror came across her face. "Shit! I can't graduate if I fail this course! Please?!!" As she was speaking I couldn't help but glance down at her ample cleavage flowing over the top of her low-cut tank top. Just my luck, she caught my eyes and saw an opportunity, "Do you like my tits?" she grinned mischievously. All I could do was stammer after being caught. Then to my shock she took my right hand which had been resting on the desk and placed it on her breast, moving my finger in circles on her nipple and making it pierce through her thin shirt so that it seemed like she had nothing on at all. I hadn't had sex in about 3 months and my wrists were getting pretty damn tired, so to speak. I was never very aggressive about getting in bed with a woman, but something came over me that afternoon. Her willingness to do anything for a simple letter in the grade-book turned me on so much that I stepped forward and wrapped my left arm around her, pulling her into my hard cock to show how much I needed her. She gasped, obviously not expecting me to be so aggressive and willing to move on her offer. She didn't have time to contemplate anything as I kissed her hard, pushing my tongue into her mouth. She started to pull back but then returned the passion as she quickly got very turned on. When I came up for air she mumbled "What do I have to do to get that grade?" "You are going to suck my cock and then let me cum inside your wet pussy." "Yes, sir" She immediately knelt and pulled down my pants and boxers, freeing my 8" rod to the cool air. She looked up at me with an approving nod and began to lick every inch of my cock, finally deep throating it like no one has ever done for me before. I couldn't take too much of that without blowing up in her mouth, so I told her to stop because I was ready to fuck her. I lifted her ass onto the desk and pushed her legs apart. The miniskirt involuntarily bunched up into practically nothing, displaying a beautifully shaved and dripping cunt, ready for a good hard fucking. "Please give it to me!" she moaned. I replied "No, I think I am going to make you wait" as I very gently brushed my fingers over her clit, sending tremors through her body. I had never seen a girl get so horny from sucking cock! She continued to beg ..."Don't make me wait, please." I took the tip of my dick and rubbed it up and down on her clit, making her groan and want me even more. I continued to tease her "I don't think I want to do this, you are going to have to retake geography next year." "Oh no! I'll do anything!" "Get off the desk and bend over" She hopped off, partially turned, and reluctantly bent forwards. "You've been bad, you missed your test. Now you have to pay the price" I smacked her naked ass enough to make a loud noise and leave a pink handprint. Exactly as I spanked her again I inserted two fingers on my other hand into her dripping pussy and this was enough to send her into a back-arching, silent-screaming orgasm. I couldn't wait any longer. As she still leaned over, expecting another spank, I thrust my cock completely inside her very slippery pussy. She screamed, half from surprise and half from the immediate orgasm that flowed through her body. I quickly pulled out almost all the way and pumped it in again hard, starting the hardest fucking I had had in years. "Do you know why I have to fuck you this hard?" "Because I have been a bad girl!" "That's right, so now I am going to fill you with my cum!" That was pretty true, as I was giving it to her so hard and fast I was almost ready to shoot gallons of semen. She came again and hearing her moan was enough to set me off. I had to bite my lip to keep from letting the whole school know what we were doing in the geography room. I gradually slowed down as the amazing orgasm subsided. She stood up, pulling me out. "So what grade does that earn me?" "C+, but that might be able to be changed." My sly look told her everything she needed to know.