John's POV
Then before the seventh month full moon, his flatmates asks him a question, "John do you trust me?"

Tilting his head to the side he nods slowly, "Of course, why?"

"I want to give you five drops of my blood." The vampire replies quietly, looking like he is ready to run.

For several minutes they stand there in silence before he finally asks softly, "Why?"

Shifting from foot to foot for a long minute the tall man just stands there before finally answering, "I think it would heal your shoulder and allow you to run again if you wanted."

"You wouldn't look so nervous if that was your only thought. What is it?" he questions as he takes in his friends demeanor.

"Some werewolves respond badly to vampire blood. We could run some tests the first night, take a few samples of your blood, mix it with mine, see what happens." His friend responds quickly.

Smiling reassuringly, he nods, "Blood test first, then we will see alright?"

His flatmate grins at him, quickly running over to the cupboard where he keeps needles and pulling a brand new, still sealed box out before grabbing a few slides and returning to the table. "Come here John, we can do this now, and then we can do it again each day of the full moon. To see if it effects it any." His friend happily replies motioning to the chair.

Groaning, because he did agree, he moves over to him and allows the younger man to draw his blood before watching as he draws some of his own. The next several minutes are quite as the two of them watch the results, his vampire through his microscope and him by watching the vampire. When the younger man smiles in relief, he smiles back.

For the next three nights they go through their normal full moon routine except for one small change, each night Sherlock draws a few samples of blood before he changes, while he is a wolf, and once he changes back before doing the same with his blood. Each time he checks the blood, quickly writing down the results and grinning the entire time.

When he is done he announces, "After four days of testing, I can say the results are definite, you can have a small amount of my blood without it harming you and with the desire affect. So before the next full moon I'll give you a shot with exactly five drops of my blood in it."

He nods slowly, determining that he is willing to try. The idea of being able to run again is one he appreciates. He had adjusted well to being a wolf but had not adjusted well to not being able to act like a wolf after the bullet had nearly killed him.