"You look so perfect like this" he said with a little purr before picked up the pace, stroking Mac a little harder and faster. More than anything he wanted to see what Mac looked like in his moment of bliss, and he wanted to be fully aware of his surroundings the first time that happened. So, he focused on Mac's pleasure more than the fact his own arousal was growing at a quick pace.
He wasn't sure how much longer he could wait though, so his pace and intensity increased once again as he looked down at Mac. "It's okay, Mac. Just let go" he encouraged with a little grin.