They're both anthologies for editor extraordinaire Rachel Kramer Bussel.
One is short short BDSM erotica.
Editor Rachel Kramer Bussel is looking for short short stories of 1,200 words or less focused on the theme of BDSM from a submissive perspective. While the word count is short, I want complex stories with a beginning, middle and end, not simply scene snippets. I will consider stories from a dominant's perspective if that is the best way to illuminate the mindset of the submissive. The final book of 69 stories will contain an extremely wide variety of characters, POVs (I welcome first, second and third person stories), settings, scenarios, motivations, experience levels, motivations, BDSM practices (which can be combined with other sexual acts), fetishes, couplings, relationships, etc. All genders and sexual orientations welcome. All characters must be over 18; no nonconsensual activity, scat, incest or bestiality. No poetry. Original, unpublished stories only. Stories from authors I have not published before are especially welcome. See my books Please, Sir; Yes, Sir; Please, Ma'am and Yes, Ma'am to get a feel for the types of submissive stories I enjoy. See Gotta Have It: 69 Stories of Sudden Sex for examples of 1,200 word or less erotic stories.
See full guidelines in her original post (and you should absolutely click through because she included a lot more instructions than what I've excerpted here).
The other is Best Bondage Erotica 2014.
Best Bondage Erotica 2014 will collect the best bondage erotica stories around, focusing on a range of techniques, implements, characters and scenarios, from newbies to seasoned bondage players and everything in between. Bondage should be a central focus of the erotic element of the story but the plot does not have to hinge on bondage. The final book will include stories focused on both the physical and mental aspects of bondage, from varying points of view. Bondage plus other sexual activity is welcome (spanking, tickling, exhibitionism, voyeurism, intercourse, oral sex, teasing, etc.). Original, unique, creative characters, settings, scenarios and forms of bondage are encouraged. As befitting the title, I’m looking for the best, hottest, most creative bondage erotica for this collection. All genders/sexual orientations welcome. No poetry.
Original post here (and, again, you really want to click through to read the full instructions).
And if you can't wait until next year to read BDSM erotica, don't forget to check out Best Bondage Erotica 2013, which includes my story, "This Is Me Holding You."