OP here
Don't know if this has already been reprompted, but:

Sherlock is kidnapped by Moran/an associate of Moriarty's/Jim himself.
Under threat that John, Mrs. Hudson, Lestrade and Molly will all meet a very specific awful end if he doesn't comply, Sherlock does not attempt to escape.

His captors try and force him to by treating him cruelly - trying to provoke him, sleep deprivation, humiliation, abuse whatever.

Sherlock may go a bit mad.

Bonus if he shows up on one of his friend's doorsteps three years later, completely mute and catatonic.

Bonus if someone (Mycroft, etc) pushes to have him sectioned.
I don't even know what I'm prompting, I just want a nearly beaten Sherlock that needs his friends very desperately.

Even if the original filler is still around and would like to finish, that would be awesome.