Seriously, though, have fun with the tag commentary if you like. But please try not to do that outside Tumblr. It doesn’t matter on this site, because its tags policy is crap anyway, but on other sites tag metadata is important to data organization and preservation, and users’ ability to navigate and hold conversations.
It costs sites like AO3 a lot of time, effort and money to clean up from Tumblr-style tagging.