It's a boring spring day at school. We're both seniors, in math class, pre-calculus. You are really good at math, always eager to answer questions in class and always being the one person to break the curve. Because of this, though, you're kind of pegged as the nerd of the class. Even though you're pretty cute, most girls are more interested in the jocks.
Because of this, you are a virgin, and worse still, you turned 18 two months ago. As per societal decree, upon your 18th birthday, you are no longer pleasure yourself, initiate sex, or cum without help from a female. Sex Magic binds you to these rules, making it physically and psychologically impossible for you do these things. Unfortunately, you're mother is no longer with you, and you have no siblings, meaning you can't even rely on a female family member to help you out. Maybe your aunt, if she didn't live halfway across the world. And wasn't a complete bitch. And, so, you suffer in silence, your balls aching, but with no chance to do anything about it. The other girls won't give you the time of day.
But then, most of the girls in the class still do not have their powers, and probably won't for another year at least. Me, well, I'm not proud of it or anything, but I got held back a couple years in grade school, and never properly caught up. So, I'm 19, going to be 20 just before graduation. I've had my powers for a while. I can easily sense the pressure in your balls, getting worse every week. Especially as the weather warms up, and the girls start wearing shorts and tank tops, even focusing on your studies can't protect you from noticing the sexiness all around you, and the aching loneliness of not even being able to get to first base. And it's driving you crazy.
I decide to take a little pity on you. As class ends, I come up to you, giving you a warm smile. "Hi, there!" I say. You almost jump at that, and seem genuinely stunned that I would be talking to you. I hold back a smirk as I easily see in your head that you've fantasized about me before, back when you could still masturbate. This is going to be fun. "So, I'm really having trouble with the material. I was wondering if you could help me out? I could use a good tutor."
"Oh, uh, sure!" you say, with an eager smile. "Certainly!"
"Great! So... you free now?"
"Um, well, I guess so. I mean, I gotta go to chess club right after school but—"
I lean down over you a bit, giving you a good view of my cleavage. "Pleeeease? The sooner I can understand this, the better!"
You gulp and nod slowly, nearly hypnotized by the sight of my breasts. "Great!" I say, bouncing back up. Your eyes follow the movement of my breasts, and I can't help but grin. You are completely enthralled, and I didn't even need to use my powers! "I'll give you a ride to my place, then I can drop you off at yours. Sound good?"
"Y-yeah," you say, voice almost a squeak. "Sounds great!"
The whole trip to my place, you keep sneaking glances at my tits and a few at my legs. Before you know it, you have a hard-on, the tension in your loins making you something of a hair trigger. Your hesitant to get out of the car until your erection goes down, but I insist you come out, pretending not to notice. I almost use my powers to make your erection permanent, but I don't need to. You're so excited just being able to hang out with me, your balls are so fully, you can't control your cock.
We go inside and I take you up to my room. My folks aren't home. I sit on the bed and pat a spot next to me, offering you to join me. You gulp again, but do so, very clumsily hiding your erection with your books. You don't realize I have Sex Magic yet. You probably think I'm still 18. Oh, man, this is going to be fun.
As we go over the homework, I lean in close to you. Your eyes keep sneaking over to my cleavage, and I have to keep refocusing you back on the task at hand. "You seem quite distracted," I say, innocently. I lean closer into you, and my breast brushes against your arm.
You flush bright red. "I... uh... I..."
"Something on your mind?"
"N-no! Not really..."
"Oh. So you weren't staring at my breasts then?" I snuggle a little closer.
"Oh, god... I mean, no! No, I-I-I wasn't!"
"My legs then?"
"No! I wasn't peeping, I swear!"