(Warning: mature includes, strong language, kidnapping, boyxboy, and smut) yay!!!!
I don't think you can be diagnosed with Stockholm syndrome, it's more SOMETHING you develop while you are kidnaped like beauty and the best with what happened to Bell.
That's not how Stockholm syndrome works. You can't be diagnosed before you are kidnapped because they have no way of knowing if you have it since usually people don't get kidnapped everyday.
I thought it said Sherlockhome.... but I read it again than I was like oh I'm dumb, wow I didn't even think it was supernatural related.....
Oh you're kidnapping me? Are you hot? Yes, well ok then I'm fine with this!
ROSES ARE RED
THERE THORNS ARE PRICKLY
THAT EXCALATED QUICKLY
Stockholm syndrome is not developed like that. It is when one feels an attraction to someone that has already kidnapped them. Like Belle from beauty and the beast and Yuukiteru from Mirai Nikki/Future Diaries.