Draco felt himself go wide eyed with panic, he hadn't thought Potter would drink the whole thing. He was about eight five percent sure Potter was a submissive wolf, but even if he was a submissive, drinking that much of the potion that fast could be dangerous. The potion was designed to bring the inner wolf to the surface long enough to be categorized as either Submissive, Omega, or heaven forbid, Dominant. Severus had stated in his notes that as a precaution he should set up wards but at this point Potter had had drank it so fast that he didn't have time.
Before Draco could think what to do, Potter's eyes went yellow as he suddenly launched himself at Draco. Draco didn't even have time to feel afraid, before he found himself pinned to the ground. When Draco squirmed, trying to dislodge the werewolf, Potter snarled and Draco yelped as the werewolf suddenly bit into his neck.
Draco felt terror seize him at the same time he felt the sharp pain. The pain wasn't anything new, between his father and being a death eater Draco had felt a lot of pain before and had gotten use to it. It wasn't the fact that Potter was a wolf either, it was still a few weeks before the full moon and Draco knew for a fact that he couldn't be turned into a werewolf, after Greyback he had taken the only precaution a wizard could take and had discovered his animigus form. So if it wasn't the pain or the fear of being turned then why did Draco feel a mix of terror and horror as Potter's teeth broke the skin of his neck?
It wasn't till Potter pulled back and ran his tongue gently over the bight, lapping up the few stray drops of blood, that Draco remembered an obscure text he had read a few days ago on wolves, and their mating habits. Draco felt his chest constrict and for a moment he thought he might have a panic attack. He had to force himself to think that Potter was just showing his dominance and that this was not a claiming, Potter wasn't gay, and he didn't fancy him. By the time he had evened out his breathing Potter seamed to have gathered his own control as he gasped out, "Malfoy?"
Draco snarled "Potter! Get off me! "
Potter seemed torn for a moment, his eyes flashed yellow and he let out a small snarl. Draco, quickly dropped his gaze and tilted his head just so, displaying his neck. Not because he wanted to but because he knew it was the only way to placate Potter's wolf, who was obviously a dominant. When Potter had calmed down and the yellow had began to fade from his eyes, Draco mumbled, "Please get off me."
Potter slowly pulled away, and suddenly as the last of the yellow dissipated, Potter seemed to notice the bloody bight for the first time as he gasped out, "Oh god, are you…"
Draco snapped, "It's fine."
As he slowly pushed himself off the floor, being careful not to meet Potter's eyes and risk possibly bringing the wolf back to front at the prospect of a challenge. Potter reached out as if to touch the bloody wound and Draco cursed inwardly for flinching. He was a Malfoy, he should never flinch. Potter looked like he was going to cry as he asked, "Oh god, does this mean you're…?"
Draco cut him off by snapping, "The full moon is just over two weeks away. I repeat, I'm fine. I've got all the information I need for the potion, you can leave now."
Potter looked like he wanted to protest, Noble Gryffindor that he was he couldn't leave someone he thought he had just hurt, so Draco put as much venom into his voice as he could muster as he shouted, "Get out Potter!"
Potter gave Draco that kicked puppy look as he flinched at the cruel note to Draco's voice. As he scurried out of the room he let out a quite, "Thank you."
Draco waited till he herd the whoosh of the Floo, signaling his departure, before collapsing to the ground and clutching at his throbbing neck. He would have to read up on this whole ordeal, but that could come later, right now he just needed a moment to collect himself.