During my first year of university I got to know a shy, nerdy classmate (both of us had recently graduated HS and turned 18). We usually sat next to each other in classes that we had in common. I noticed that he often poked at his crotch with the back of his pen during lectures. This usually resulted in his dick getting hard and trapped in the leg the jeans he would wear. I found it hard to concentrate as it was distracting. He wasn’t the most handsome guy, but seeing him hard and playing like that made me horny.
During one particularly boring class we were sitting by ourselves in the top row of the class theatre. As usual, he was poking at himself and I decided to act. I let the back of my hand drop to the side of his thigh; when he didn’t stop what he was doing I turned my palm up and pushed harder against him. He turned to me and I leaned over and whispered in his ear that he must be awfully horny all the time. I could see him blush but he nodded. I quietly asked if he masturbated regularly; he blushed harder but again nodded. I put my hand fully on top of his thigh, my fingers touching the hard tube in his jeans. I whispered that a hand would feel so much better than that pen. He didn’t say anything but I noticed he took a deep breath and pulled his pen away. I could feel his leg trembling under my hand; I quietly asked if he’d ever been touched by someone else. He shook his head. I began to rub his hard cock through his jeans; I could feel it flex to my touch and within a minute a small wet spot had formed where the head was pressed against the fabric. I continued rubbing him and was about to lean over to ask him if we wanted to cut class but before I could I felt his cock lurch and flex within the tightness of his jeans. He took a deep breath and then I felt the wetness of his forceful ejaculation against my hand. I watched as cum soaked through and down the leg of his jeans.
As soon as I removed my hand he grabbed his books and bolted out of the back of class.