Captain Kirk left Khan and Marla McGivers on Ceti Alpha V with the other 72 augments. Six years later, he learns that the planet is doomed to destruction. Sequel to fic "Sins of the Lion."

Lt. Rebecca Duval is a seasoned Section 31 operative. The job is her life and she lives it with single-minded dedication; orders are followed to the letter and without question. When she's assigned to act as handler to Commander John Harrison, everything changes. He's ruthless, he's calculating...and now, he's her responsibility. Khan/OFC. Now fully earning the M rating.

REWRITE OF THE ORIGINAL; Madelyn wanted to melt into her seat so he couldn't see her, or break the silence with a biting remark and rid herself of the angry questions flying through her head. The only thing she knew for sure now was that he was dangerous, and that as soon as he was put into Federation custody, she never wanted to see him again. (Serious M rating; Khan/McGivers AU)

Dr. Alice Walsh was a rising psychologist in Starfleet until one mistake leaves her career nearly destroyed. But then she's ordered by Admiral Marcus to take on the most challenging of assignments: evaluating and rehabilitating the awoken Khan. But her orders are an illusion, the truth more sinister, and her loyalties are soon tested, along with Khan's own beliefs ... Khan/OC

Basically Khan/reader smut with a dash of plot, in which Admiral Marcus is an evil bastard who runs tests on his prisoners, and Khan has a heart… in his own superior way - 2nd person POV, possibly slightly AU - rated M for a reason.