I Will Submit (Only To You)

How didn’t I figure out that he’s a werewolf? Derek raged in his head, and his eyes widened when the Alpha tilted his head to the right with a small smile. The huge pressure disappeared making Derek almost fall to his knees. He managed to stay standing, but his tongue was still tied. He had no idea what to say.
“Harry James Potter,” the Alpha offered his right hand to him, and Derek took it hesitatingly, unsurprised when he felt the strong grip of the other werewolf. “It is a pleasure to finally meet you.”