If (слэш)

John Watson knew his arrangement was due to come to fruition that year, so when he found an omega in his living room one afternoon, he wasn't entirely surprised. Except that said omega was young enough to still be in school, and hadn't even had his first heat yet.
With John refusing to take advantage of Sherlock, the two of them begin a strange co-habitation somewhere between family and friends. But as Sherlock and John get older, and Sherlock begins to mature, will nature pull them together, or push them apart?