Prompt fill: A New Strain

Title:  A New Strain
Summary: John starts to wonder about Sherlock's real nature
Pairing:  Sherlock and John, maybe pre-slash if you squint through your slash goggles, but probably not
Rating: R, for language
Warnings: talk of vampires, some mild Twilight-bashing
Spoilers: None
Disclaimers: Not mine.  Just borrowing them for a while.
Author's Notes:  drabbly-type response to darkmagic luvr's prompt over at Sherlockbbc's Make Me a Monday thread found here:   http://community.livejournal.com/sherlockbbc/1651936.html?thread=23126752#t23126752 .  Not betad or brit-picked, so be warned.  This is the story formerly entitled "My Flatmate the Vampire."  I just thought of  a better title.


 

 

( It had started out as a sort of inside joke within his own head. )