Kirk/Spock
Speaking in Tongues by
feels_like_fire (Mirror!Spock/Mirror!Kirk, NC-17, 11,544)
Summary: When Spock became Emperor, the first thing he did was claim James Tiberius Kirk as his slave, body and mind. But Kirk, being Kirk, has serious trouble with authority, and Spock is pressured by his advisors to discipline his former captain. Permanently.
(Warnings for dubcon, BDSM, and lots lots more. Please heed the numerous warnings for this fic!)
Notes: DARK DARK DARK AND HOT LIKE BURNING, as you might expect of Mirrorverse fic. Underneath the porn is Kirk and Spock's relationship, which is somehow romantic and just them despite being completely twisted and wrong. Satisfying, hot, and heartbreaking.
A Vulcan on the Streets (but a Freak in the Sheets) by
kyliselle (Kirk/Spock, NC-17, ~6500)
Summary: Spock harbors a secret fantasy of bottoming for the toppiest top in Topsville. Kirk makes all his wildest dreams come true. (Warnings for light daddy!kink, spanking and powerplay; rimming)
Notes: This takes some of my favorite kinks and does them up right! Scorching hot, funny by turns, just awesome.
Kirk/McCoy
Roman Elegy by
lindmere (Kirk/McCoy, NC-17, 2,220)
Summary: Jim, Bones, sex, red wine, and a suggestion of cigarettes.
Notes: This is almost too much a slow, sweet relationship/character study to belong in the porn category, but then there's also the hot semi-public sex... What's lovely is how real and understated it all feels - the imperfect patterns of an established relationship that is still very much alive and well.
Other
Karma and
Redemption by
graceandfire (Mirror!Kirk/Mirror!girl!McCoy, Mirror!McCoy/Mirror!Rand, Mirror!Kirk/Mirror!Rand, Mirror!McCoy/Mirror!Chapel, NC-17, 10,800)
Summary: In a Mirror Universe where women are second class citizens and Mirror McCoy is just as bad as the rest of the men, he gets turned into a woman. And Karma's a bitch. Warnings: Non-con, physical and emotional abuse, sexual humiliation, a setting where women are treated as sex objects, Kirk is a total bastard, McCoy starts out as a total bastard. Bondage and spanking.
Notes: The nice thing about these fics is that the totally hot dirty-wrongness is helpfully balanced by the lessons learned, the revenge achieved and the various manifestations of female agency in spite of a seemingly impossible context. Total performative contradictions...? Or the perfect blend of right and wrong? You decide. (Don't even ask me how I just used the words 'agency' and 'performative' in a porn rec. IDEK.)