My Step Mom Knew How To Motivate Me

It was no surprise to me when my parents divorced, my dad moved a few states away taking a promotion with the company he worked at and my mom was like see you later not moving again. What did surprise me was like two years later when he remarried and the woman was not this twenty year old gorgeous blonde or something, she was like three years younger than him and a bit curvy and brunette.
According to my mom I was getting to be handful, early teens and since I had not started high school yet I was going to live with my dad for some guidance a young man needs. About a year into all of this change, I was getting along with the new situation quite well in my mind, new school a few new friends but apparently my grades were not where everyone thought they should be. Step mom started tutoring me, she did not work so had a lot of time to help me out, comes into my room one evening after dinner, my dad is out of town for a few days and she tells me she thinks she knows the motivation I need.
She came over to my desk area and starts quizzing me on what I am working on, when I got a question correct she said Good! Now pick a button to undo. I am staring at her wondering what she means, she tells me pretty simple, you got one right pick a button on my shirt to undo. So I do it picking the top one, she sits back down on my bed and keeps up the questions, keeps letting me undo a button when I am right then we end with like two buttons left and plenty of cleavage showing. She tells me to study up on these, we will do this again tomorrow after school and adds who knows, if you get enough of them correct you might get to my nipples.
I am like WTF did she just say? I ask her what she is talking about, she tells me for every correct answer I get to undo a button, then her bra, then I get to touch them and so on. Get the picture now? I studied, man did I study, evening three she is in my room blouse buttoned like usual. We start and I have all buttons undone with like six quiz questions left, her shirt comes off and I am two questions away from seeing boobs. I get her bra undone with the next question, bra off with the next one and am just in a daze staring at them. I get the next question right and she says Okay, one minute, touch them all you want.
So I have three questions left and I have the presence of mind to ask her what I get for a correct answer on them because she is topless and I have already touched them. She smiles at me and says Tell you what, you get the next three correct and I will let you pick what you want to do. She is sitting there topless, talk about a distraction, she starts playing with one of her nipples as she reads the question to me. I get it correct along with the last two and I literally jump up out of my chair excited over it. She says Okay, great job so what do you want to do? I say You completely naked on my bed, ten minutes of touching?!?!?
She just does it, stands up, undresses and lays down telling me Okay, Ten minutes starts now.
My fingers are shaking as I run them all over her boobs and down to her pussy, she spread her legs out for me, was really enjoying letting me to this and I am getting an erection. The time is up and am just beside myself excited and she knows it, she asks me how that was for getting me to study, I am like Totally Awesome is what it is and she tells me a mind blowing thing. Tell you what, you get over a 90 on your next quiz and guess what? What? I ask her. she reached right out and squeezed my erection thru my bottoms and says she will take care of that for me.
Even my dad could not believe my studying, told me I was doing a great job and I was really, she was not doing my homework for me but was helping me get there with tutoring. I bring home a score of like 92 on a quiz in math, I am just bouncing off the floor excited showing her, she looked over at the clock and said Well, we better get up to your room then. She knew exactly what to do to make this amazing, knelt down and told me to drop my pants, sucked me to the base over and over until I came and she swallowed every bit of it. She looked up at me, still gripping my cock with one hand and said Bet you get above a ninety on all of them now won't you?
I only lost out on one of them the rest of the time, summer came and when my dad made a comment about my GPA being just amazing, she winked at me saying the same thing. Like two weeks into summer break he left again for a few days, I had like another week and I would be gone for most of the summer back at my moms. She came into my room the first evening wearing this see thru robe thing, told me anything I want we would do, then told me the best part was no way she could get pregnant and she laughed. I did not want to go to my moms house, my step mom assured me I had to go, she is your mom and will be devastated if I don't go. She told me not to worry, the fun will continue when I get back here.