The funny thing about running a small kink blog is that the longer you do it the more you realize you are engaging in an art form, and this, like all arts, leads you to have a deep respect for those who are really masters of the medium. Hornyposts made for the benefit of others are much like writing, say, a tragedy for the benefit of others. You're looking to stir up a specific emotion in your reader, and people who are able to do that really well are masters of their medium. So even though I never post on here, and there are one or two people who actually follow this blog at best, I thought I'd shout out a few people who I think are really good at this whole "being horny on Tumblr as a public spectacle" thing.
Now, my favorite and personal inspiration, unfortunately, has deactivated, but shout out to Ms. Natalie Sapphicwork, @saphiccwork, she was truly wonderful at this.
@pokeballvictimized doesn't post longform hornyposts often, but when she does, they're always a treat. Unfortunately, Tumblr staff killed the poor girl for being transfem a while back, and I don't believe a lot of her better stuff was archived, so there aren't too many still kicking around. Warning for sexualization of pokemon and CNC posts. Though she and I generally post from opposite sides of the dom-sub spectrum, I know she's brilliant at this medium from the near fanatical devotion she sometimes gets in her tags.
And, last on this list for now, @ace-trainer-alice, is absolutely lovely, and if you haven't heard of her, I would recommend looking through her posts to see if that appeals to you. Much of what she's into and posts about is the kind of thing I very much am not into, but that doesn't mean I respect her as an artist any less.