We heard the footsteps getting closer and closer to us. We both held our breath, not daring to make a sound, wondering if we were about to be caught fucking in the library. I had no idea what would happen if we were, but I was sure it wouldn't be good.
But the steps continued and walked past us, slowly getting fainter as their owner walked away. I looked down and noticed that instead of wilting, my exposed cock was throbbing. I guess the thought of getting caught having sex in public was turning me on. It must be turning you on too, because despite the fact that you just came hard, your hand was between your legs, rubbing yourself over the soft fabric of your skirt.
You look up at me and start laughing, either at the relief you feel or the look of relief on my face. For some reason that pisses me off. Maybe it's the shame of being almost caught or the fact that I've never been more turned on in my life, or some combination of the two, but I needed to fuck. And I needed to fuck right now. I spun you around, pushing you up against one of the windows. Your gasp and surprise turn me on even more. I pulled your tight shirt up over your head and down your arms. Your arms get pulled behind your back as your shirt slides down them, giving me an idea. I quickly grab your wrists together and wrap the shirt around them, tying it in a knot. Your arms are now tied behind your back.