Love by Blog Entry and Rude Interruptions

Sherlock is asexual and John is straight as a ruler. Or so they think. Sherlock is actually feeling something and it comes to surface while John is writing a blog entry. John also has feelings that come up while writing said blog post. So,instead of berating John,as he usually does, about his stupid blog,Sherlock does something quite different. So now the real question is,is John really straight and is Sherlock actually asexual? *All Fluff. No smut. Some established Mystrade. Some Johniarty that will never happen. Mainly Johnlock*