Ok I had a go at drawing batjohn originally started by ivorylungs, If you're not familiar with that check her tumblr. I also have a headcanon that Sherlock sometimes drugs John's berries for experiments, resulting in John being able to turn humansized at will. Also featuring mothlock, John is very possesive over his precious berries.
"Oh, John, I envy you so much"
Oh MY GOD I did not know you were a Sherlock fan!
He should do what his ancestor did, and test the berries on John's dog first.