I can totally picture a Sherlock that was raised by wolves! Like he got lost when he was younger and everyone thought he was dead. Mycroft never got over it, so when 15-20 years later, people find this man running out in the woods with some wolves, he wonders. Once he sees it really is his brother, he brings him home. It a very confusing time for Sherlock, but eventually he manages to learn enough about humans to convince Mycroft to let him live alone.

Sherlock likes solving crime because it reminds him of tracking and hunting with his pack. He doesn't have a high opinion of humans, but John is different, he's almost like a wolf.