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Warning : *squeezes lemons in front of you*
I'm not sure whether it's detailed or not but read at your own risk, don't say I didn't warn you :P
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Reiji Sakamaki, your boyfriend of three years. You were still in senior high school and he graduated college early as he was a genius during his days. You didn't like basic calculus at all. It wasn't even basic! Who ever invented basic calculus, you were to strangle him!
You asked Reiji if he could tutor you and he agreed. You came into his house and see Reiji all prepared for the study session. On top of the table contained some coffee and your favorite snacks that could keep you awake. You were trying to study as you had an upcoming mid-term exam. You didn't want to risk your chance of not going to your aspired school so you decided to risk your sleep just for basic calculus.
"Okay for this function, you need to..." You ruffle your hair, frustrated at the subject. You still couldn't get anything after 30 minutes. Suddenly, Reiji had an idea. "Babe, let's try my way. If you get a question right, I'll reward you." Your head perked up, seemingly interested with the reward. "Ooh, it is (Favorite Thing You Want)?" Reiji smirks. "Focus first and I'll tell you." After two hours of Reiji's lecture, you seem to get the hang of it. "Time for some questions. Are you ready (First Name)?"
"Anything for (Favorite Thing You Want)!"
"What are the three conditions that you must satisfy for the function to be continuous?"
"Uhh..." You scratch your head.
Reiji brought you closer, sitting you onto his lap. "Hmm? I can't hear you." His arms snakes slowly on your waist, dangerously close to your flower. "f(a) must exist." Reiji smirks. "Go on." He pinches your inner thigh as you were only wearing a loose shirt and shorts. "Mhn... limit of f(x) must exist if x is equal to a..." Reiji touches the soft fabric covering your nether regions. "You have one more." Reiji whispers. "Limit of f(x) is equal to f(a) if x is equal to a." Reiji found your clit and pinched it. "Bingo."
It kept going for a while until he stopped his administrations which made you whimper. "Why did you stop?"
"Babe, I can't hold it in anymore if you keep pushing yourself onto my dick."
"Like this?"
You tried to act innocent as you kept grinding onto his clothed member. Reiji could only groan in pleasure as you continue to do the act. "Babe, doing this is dangerous. Don't you like it better if we're both naked." You only stuck out your tongue at him. You unbuckle his belt and unzip his pants, taking in his huge member with dripping pre-cum into your mouth. Your tongue swirls against it and he came inside. You swallow the whole bitter taste of semen. You remove your shorts and underwear, exposing your flower. You slowly inch yourself down onto his member, taking him whole.
You start bouncing, moaning as Reiji leaves hickeys on your breasts. You could feel yourself closer to the edge as Reiji steadily increased his pace, slamming his member into you. You could feel his member twitch as he was inching closer to climax. In a swift motion, Reiji turs you around on your hands and knees. He pounds into you in a monstrous pace before releasing his seed deep into you. Seemingly, you got the favorite thing you wanted in the world...
His dick.
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EXTRAS :
Reiji chuckles with you laying tired on the bed asleep. "Guess who's failing basic calculus tomorrow?"
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Alternate Ending:
Although you were a bit sore from the activity you had done with Reiji, you pushed through studying basic calculus. The next day, you took it with ease. When the results came out, you were happy with your score and showed Reiji. Reiji nodded in satisfaction. "Having rewards seem more effective to get a perfect score huh?" Your face turned beet red, softly hitting Reiji on the chest. "I have statistics midterm exam tomorrow... can you help me out again?"
