Duncan tried to push any and all thoughts from his mind and concentrate on the feeling alone. Being buried deep inside of another vampire, not having to worry about being careful or gentle. The teasing from Byron, only pushing him further to embrace his own nature.
He growled once more before sinking his teeth into Byron's neck shortly after Byron took his own bite into Duncan's wrist. Latched on with his mouth, Duncan's hand tightened around the other vampire's hip as he began to thrust himself in and out, working towards a goal that he hadn't achieved in centuries.
After a moment, Duncan's mouth released it's hold on Byron's neck and he jerked his wrist away so that he could place both hands on Byron's hips. Had it been another, had he cared for their release, he would have reached around and sought out his length, worked to please him. But as it were in that moment, it was his own release that concerned him. Freeing himself from having to be careful, fueled him to push forward faster. Not bothering to limit himself, but hammering over again and again without abandon.