In the Brothers Consulted sneak peaks Stan meets smolls for the first time, after being informed of their existence, and in Brothers Kept their already known to the world… But what would happen if he didn’t known of their existence before interacting with them for the first time? How would he react? grab? Freeze up? Trap? Offer them tea with biscuits or cookies?! Also, what if John was the one to discover the brothers, and not Sherlock? How would this affect the relationships between the four?
Stan is lowkey a g/t nerd himself, so even if he’d never heard of borrowers before or had any idea they were real, he’d have generally positive reactions. Depending on the circumstances he might get a little overexcited and even a bit grabby, especially if the smol tries to run away before Stan gets to introduce himself and learn more about the smol!
Aside from that it would mostly be amazed stares and curious questions. If the smol stuck around, they would learn that he’s receptive to their feelings regarding the meeting, and will adjust his behavior to try and make them more comfortable.
Wouldn’t leave tea and biscuits completely off the table.
As for John, we mused ages ago about a few situations in which he was the one to find Sam and Dean before Sherlock, ones that probably aren’t likely to be written into full stories since it’s not likely to change the overall dynamic and story from what’s been established in Brothers Consulted. Mostly it builds trust with John a little earlier on since he’s more likely to let them go about their business if he accidentally finds them.
The tiny imaginings on what would happen if John found them first are always so sweet and cute. What if John did grab Sam out of his coat pocket? What if he reached just a little too far and ended up with Sam instead of a teabag? What if he figured out the sneezes weren’t coming from the kitchen?
The poor guy would be a nervous wreck thinking he was going to stumble over tiny people at any second.