Soo... there's a condition called Diphallia, i.e. someone is born with two peni(ses?), and there is one case known in the USA where both are of regular size and function: http://www.reddit.com/r/IAmA/comments/1u75hh/i_am_the_guy_with_two_penises_ama/
So I'd love a story where either John or Sherlock has Diphallia, without the other finding out until discussion of this anomaly becomes necessary because things are heating up between them. I'd like them to end up in a happy, porny relationship, but how the other initially reacts to the revelation is up to you. I am also not at all averse to John/Mary(or another third party)/Sherlock.
John or Sherlock has two functioning penises
So I'd love a story where either John or Sherlock has Diphallia, without the other finding out until discussion of this anomaly becomes necessary because things are heating up between them. I'd like them to end up in a happy, porny relationship, but how the other initially reacts to the revelation is up to you. I am also not at all averse to John/Mary(or another third party)/Sherlock.