Anatomy, obviously.

Of course when they finally met up in a quite corner of the library, hidden by books and two walls, he would have to teach her about anatomy. In this case the female and male body. He calmly pins her to a bookshelf, with one hand gently around her throat. "Now, you know what a pussy or cunt is, but we have to show you how to properly use it for pleasure. You want to start slowly here." He slides his hand, the one not around her throat, down her stomach and into the waistband of her cute little schoolgirl skirt. His fingers brush along her bare, smooth skin until they reach the very top of her slit, almost grazing into her warm crevice. He smiles as he feels her body tense up in anticipation and the smooth motion of her tounge glazing her lips with spit, he has plans for that later, but for now. He slowly slides his middle finger far enough into her slit that he can bump the little nub near the top. "This is your clit. I'm going to use it to make you feel good. Do you understand so far?" She nodes, but can't seem to find her voice, making her feel like a certain mermaid. He gently draws circles in the skin of her lips with his finger, just barely coming into contact with her clit. She trembles with every gentle brush of him. "Have you ever touched yourself here?" He pushes down on her clit, finally making full contact with it. It takes her a moment to regain enough focus to respond with a quick and forcful shake of her head. "Never?" He asks, with a single raised brow. "Never." She whimpers. He smiles before rolling his finger around on her clit in a small circle that makes her grip his arm. He leans into her ear. "You know this," he flexes his finger, "is not the only place that you can derive pleasure from, don't you?" She doesn't have time to comprehend him before his teeth are gently on her ear and his fingers are assulting her clit with quick, forcfull motions. She tries to moan loudly, but the hand around her throat has somehow appeared around her mouth, muffling any noise she would have made. "Silence in the library." He chimes, just barely brushing his lips against her ear as he speaks. His hand slides farther down her body and he slides his finger into her warm, wet cunt. It goes in smoothly as the juices from her pussy leak out to meet his intrusion. The skirt waistband is in the way so he pulls his hand out and slides up her skirt instead, moving her thin panties aside so he can invade her cunt again, with two fingers this time. Its a tight fit, but she manages to take his middle and ring finger up to the last knuckle. Shes on her tiptoes, eyes glazed, but wide. Hand tight on his wrist. Other flaling to find something to grasp. Her knees are weak and shes sure his fingers burried in her cunt are the only things keeping her upright. The fast stroking begins and its hard to tell when hes in her and when hes out, but she can fell the heavy thump of his hand near her clit and the expansion of her walls. Her breathing is loud and harsh. He keeps pounding his fingers into her for a few minutes then pulls out abruptly and grinds them against her clit. Pleasure washes over her and she tries to scream through his hands, her legs visably shaking now. "The first orgasm of your first lesson. What shall we learn next?"