Everyone who is familiar with the captioning community already knows this, but Candy's World of TG & Transformation is a fantastic captioning blog.
It is a little embarrassing to offer such an obvious recommendation at this late date, but I think it was more embarrassing that Candy's was missing from my reviews.
Candy's Hentai / Futa captions are extraordinary. Her ability to write captions that draw you in and turn you on even when they involve strange transformations or other weirdness is unparalleled. Truly a wonderful site with a very skillful author. It is well your time to explore her archive if you haven't already.
Post Scriptum : Yes, I know it is evil of me to offer this recommendation just as Candy is going on hiatus for the holidays.