The Faithful Compass Series by KeelieThompson1
John is five/six years younger than Sherlock and is studying at university when he meets a bored, addicted Sherlock. But Sherlock still needs to become sober, learn his skills and become the consulting detective while John needs to train, find his place in the world, and in the army, to become the man that can match Sherlock. The problem is they may not be able to become these people while in a relationship with each other.
I love this series so much! I cried, I laughed…it has everything! I loved the original characters as well. Simply a very well written story. I think I’m going to read it again just now, hehe.