Sherlock is an idiot, John is a victim, Greg is in his pajamas and the alarm is much too powerful

Original Work Summary:"Prompt : That awkward moment when Sherlock breaks into Mycroft’s place for something and he’s greeted by Lestrade."Sherlock Holmes, consulting detective extraordinaire (more like shameless snoop), has no problem breaking and entering a familiar family home to solve the biggest mystery of all (One only he actually cares about solving). John is not party to this, okay? He's just here for unwilling supervision. Someone has to make sure Sherlock doesn't anger the neighbours by outing family secrets or something equally as objectionable.