There are lots of good quality TG captions on tumblr, but it can be difficult to find them in all the noise. Between the image macros demanding "reshare this if you are a sissy" and the "ask me something dirty" requests and the so called TG captions that barely have three words on them locating sexy captions that tell a brief dirty story can be hard.
So what tumblr blogs have some nice captions? Try these on for a start. I will look to find more in the future.