I believe in Sherlock Holmes (BOYXBOY) OC X ???

Baker street was filled with guests asking for sherlock's help. Till one boy plays his guitar singing a song called 'I believe in Sherlock Holmes'from a street corner watching the line go faster and faster. This wasn't any normal boy... no this was A person Sherlock knew for quite awhile, the boy had gotten extremely cautious and has grown a certain attachment to the male everyone was wanting to see the said male.
"John I'm going out to see a acquaintance of mine, probably playing his guitar by now" He says before stopping and listening. "Interesting..."
"missing combat, I was alone and lost"
"..." He goes around the corner, Now Noticing the boy whose eyes were stained a bright red from crying. "You believe in me huh?" he says scaring the poor boy. "Sherlock... "