WARNING, MIGHT NOT BE SAFE FOR WORK!
He only looked up from his phone for a moment, as the train sped by. As he looked back down on his screen, he saw he had received a snap from a girl. He pressed the notification in the top of the screen, and held his thumb to the picture. On the screen an image of a naked upper-body appeared. Across the belly was written: "U like these tits?" He did. After only a few seconds, the picture was gone, and he double-tapped the name of the girl on the screen, to reply. He held forward his phone, looked at his reflection on the screen, and made an arch with his eyebrow to compliment the question he wrote with the text: "I do. Wanna see my dick?" He sent the picture. Moments later, the phone vibrated again, once more with a notification telling him that he had received a snap. "Sure thing ;)" Said the text, while the picture was one of the girls body, all naked but the feet.
He glanced around him. It was early morning on a sunday, so the number of people was little. The platform was empty. He unbuttoned his pants and lowered them enough to pull out his penis. It was rock hard from the pictures of the girl's body. He took a picture of it, put it away, and sent it to the girl. His heart was hammering in his chest. The adrenaline was streaming through his entire body. He looked at his phone. No reply yet. More than moments passed. The initial kick was gone. He looked again. He saw that she had seen it. And not only that, she had also taken a screencap of his dick. He began to browse instagram, hoping to find something new since he last looked, about five minutes ago. Nothing new. He checked Facebook. Ofelia had reposted a video of some dog running in circles. It was only six seconds long. He checked twitter. He followed about forty different people. Nothing new there either. He put away his phone, looked up. A few people had arrived since the train passed.
Suddenly his phone vibrated. He quickly found it and looked at the screen. He had received a snap from the girl. He looked at the snap. It was a video of the girl masturbating. He enjoyed the ten seconds, that seemed to last too briefly. The text had said: "Now I want to see you do it." He obliged. Once more, he pulled out his member, and started tugging on it. It took only fifteen seconds of furious tugging, before he came. The final five seconds he got on film and sent to the girl.