I've read a lot of fic where John is incredibly patient with Sherlock's sexual hang-ups, and waits until Sherlock is 100% comfortable with sex to further that area of their relationship. But now, what I want to read, is a sexually frustrated John who has tried to be patient(perhaps for up to six months) and to help a (non-asexual, please) Sherlock become comfortable with intimacy. As much as he loves Sherlock, sex is very important to John and he ends/puts on hiatus their romantic relationship. Sherlock is, of course, devastated and humiliated. He offers his body right then and there, but John doesn't take him up on it for obvious reasons.

Either a happy or sad ending are equally fine. :) Please, just don't make John a monster.