For most guys, sex was purely about touch (in one way or another).
Logan? Not so much. He picked up on a lot more than most guys, thanks to his senses.
It was the spike in Kaylee's pheremones, as much as the clench of her around his cock that did him in. He all but slammed into her, as far in as he could go as his whole body tensed and he fought down the urge to bellow, jaw locked shut.
When the dust finally settled (provided Kaylee had two brain cells left working) ... she might notice that Logan wasn't even breathing raggedly. Nor had he moved, much less pulled out. He just watched her as she came down from the high, looking smug as hell.