Aidan looked at the blood in the bag. He knew without asking - without using any of his senses as well - that it was Peter's. He knew what Peter's blood could do. He knew what Peter's blood held. What he had no idea of was what Peter's blood would do to him. It was a risk, accepting. Aidan knew it in his heart that this could all go awry.
But he also knew what he was taking now was not sustainable on the long term. At the very least, Peter's blood would keep him quelled longer. Would keep him away from the supply at work.
That was enough for Aidan to put his hand on the bag and slide it almost shamefully toward himself as he nodded. He was thankful that Peter had not offered it direct from the source. What a mess that would have been. Worse, still, knowing that Peter would likely be able to survive anything Aidan could dish out, thus making the monster gleeful and experimental.