Every time Colin used any more force, whether scratching or biting, Zach reacted loudly. He loved sex, and he loved the use of unnecessary force. And Colin only ever seemed to flirt with it, for whatever reason, and it was teasing him insane, in a good way. But he shivered, arched up, and moaned for more, not sure if it came out in coherent words.
Then, then those words again, and Zach gasped loudly, his whole body felt it. His legs came up, trying to wrap themselves around Colin's hips, and Zach was even louder, gasping as he tried to return the sentiment.