Stiles should have known his distraction wouldn't have done anything. He heard the anger in Derek's voice and Stiles knew he would have to explain. He just hoped Derek would understand.
"That isn't it," Stiles said as he picked up one of Derek's pieces and played with in his hands as he spoke. "It just... if you haven't noticed I become hard the moment you walk into my room now. And I become hard when you touch me or kiss me and... and nothing comes of it and I am just left hard and wanting. It is hard to constantly be in that state with no release, Derek. I just wanted today to be a little easier when you left... I'm sorry."