Kellen had to cover his mouth as a yawn took over. He raised his hand from where he had them crossed across his chest, watching indifferently as his students went about their tasks. His actions did surprise a few who were waiting their turns. Kellen wasn't normally one to show how tired he was. He was normally one who didn't yawn, or at the very least, didn't make it obvious. In this case, it wasn't possible.
Kellen was tired. He knew why, and he was doing his best to not let it show that he was absolutely exhausted.
Kellen had joked about it, but Rhys really hadn't let him sleep last night. Rhys hadn't don't it maliciously, but he had pushed Kellen to the brink, over and over. Kellen should have known better, knowing who Rhys was, and especially after he had volunteered to show Rhys what he used to do in the closet.