Secrets (a BBC Sherlock male! reader insert)

When John thought that Sherlock was enough, he now had a second Holmes in the flat, acting all teenager-like, and who seems to have a talent for being cringy.
But, somehow, he knows that behind all the jokes the young man makes, painful secrets are hidden...

Warning: It's Sherlock.

Sorry if any character is OOC

(I don't own anything except this story)