John's POV
The entire month goes relatively smoothly and the day before the full moon, Sherlock runs one more blood test just to make sure before carefully injecting him with the first drop of blood and waiting patiently to see how he responds. Over the next four hours he is given the rest of the blood and his friend keeps a close eye on him that night as he sleeps. When he wakes in the morning his body feels hot, abnormally so, and he takes a long cool shower to get it temperature down. When that does not work, he decides to shift early, because he had noticed sometimes doing so would burn out any form of illness.
The results were startling, sharp, burning pain raced through his body leaving him trapped in his wolf form exhausted when he was done.
Hearing him hit the floor, his flatmate rushes into the bedroom, carefully picking him up and laying him on the bed. The next several hours are spent with the vampire carefully watching him, offering him fresh cool water anytime he is awake and not leaving his side except for when he fetches the water.
When the moon finally rises, his body goes through another wave of agony before he passes back out.
In the morning he wakes up in his human form once more. The burning is gone and his shoulder feels odd. It takes him a few minutes to realize that his arm and shoulder is not aching the way it has since the bullet had damaged the nerves. After spending several minutes experimenting with it he smirks and heads downstairs, hugging a shocked Sherlock who stares at him with wide eyes.
"What?" he questions.
"You're umm, naked." The younger man remarks with a blush.
Blinking, he looks down and realizes that his friend is right and bolts back upstairs to put some clothes on.
The rest of the day goes smoothly, his arm feeling far better than it has in years, though it is not enough to be considered totally healed. That night, before the moon rises his vampire flatmate makes a meat heavy dinner for them to share. Afterwards, his flatmate watches as he shifts and he prances around for a bit amazed at how much easier walking is. While he doubts he could do any long runs, he could run for a bit and he head butts his flatmate before heading to the door.
He is in the process of considering how to open it when his flatmate does just that. A few minutes later the two of them are racing down the street and for a change he is not the one following. It's a wonderful night full of all sorts of fun chasing and running. He even has a pack! Sort of. Well at least one other person. When his shoulder, leg, and paw start to twinge he makes a loop back to their flat, barely making it up the steps to his room before he just about collapses onto his bed. A few minutes later he hears his flatmate come up the steps to check on him, gently covering him with the blanket and petting his fur.
At some point they both fall asleep, but when he wakes up he is human with the taller man curled up with him.
His mate, his wolf side said. As he stares at the younger man he cannot help but hope but doesn't expect anything to come of it.
Closing his eyes, he allows himself to drift back off to sleep and stays that way for several hours, managing even sleeping through his vampire getting out of bed. When he finally gets up, it is well past lunch time and he discovers that his shoulder is a bit achy from overuse but is otherwise better than it has been in years. Tonight he will spend it in the flat because he does not wish to risk damaging it once more. So they return to their normal pattern of dinner, his changing, and then cuddling on the sofa until early morning.