Kismesis
The protagonists in this story are Alternians, the sci-fi/fantasy race of spacefaring Trolls from the popular webcomic "MS Paint Adventures: Hivebent" (http://www.mspaintadventures.com/?s=6&p=003889). I chose them to write a fanfiction about because they're quirky, pursuing (among others) a form of romance called "Kismesis" which is based on hate rather than love, and having a reproductive process which, in canon, is described with vague references to buckets being filled with genetic material (this fanfiction, on the other hand, contains sexually explicit references to buckets being filled with genetic material). There are a number of important, yet canonically unanswered questions about Alternian Troll reproduction, so I've had to make a lot of guesses. Enjoy.
Ketos Liwyatan drew her dagger and hid beside the door of Perthein Bher's respiteblock. She had been working herself up to this for weeks, when Perthein retired for the night from his duties as overseer and subjugglator of sector five of this pathetic conquered world and returned to his coastal estate she would overtake him by surprise. She held her breath as she heard him ascend the stairs and begin to turn the knob on the door. As he walked in, Ketos pounced at him, slashing at his abdomen with her dagger, sending flecks of purple and white flying off onto the floor. The blow was only glancing however as Perthein dodged out of the way before it could properly connect, turned, and struck Ketos over the head with a metal bar.
When she came to, Ketos was tied to a chair with Perthein standing over her, holding her knife in a hand wrapped with purple stained bandages.
"The next time you try to sneak into someone's hive you should clean up the glass from the window milady; a bunch of broken glass in front of the front door is a dead giveway and," he held the bandaged hand in front of Ketos' face so that the dagger he held hovered menacingly between her eyes, "I cut the shit out of my hand trying to clean it up"
Ketos, however, was mentally preoccupied with the chunk of candy corn hued keratin sitting on the floor benind where Perthein was standing "You cracked one of my horns you bastard!"
"That's not all I'm going to do..."
Perthein took the knife and pushed the tip into the side of Ketos' abdomen, drawing a curtain of pink, aristocratic blood . Slowly he drew it across towards the other side of her body
"Oh god!" screamed Ketos in pain, "Stop! Stop!"
By the time Perthian was halfway across, Ketos had broken down crying. As Perthian drew the knife across Ketos' belly, roe spilled out of the the wound, most of it landing in the bucket which he had placed under the chair. By the time Perthian had cut all the way across her body, Ketos was incoherent with pain and bloodloss. In her blurred view she could just make out Perthian tossing the dagger to an inaccessible corner of the room and then removing his pants. her eyes were drawn to his vent, on anybody else she would have found his hole particularly attractive, but because of their relationship she was more turned on by the idea of stabbing him.
Perthian walked up and draped himself over Ketos, in such a way that his genitals were suspended over the bucket. He reached behind the chair and untied Ketos' right hand. Perthian took her hand in his, Ketos too weak from blood loss to resist him, and guided her fingers into his cloaca, guiding her to stroke his insides to coax him to give up his milt. After several minutes of Ketos' numb, guided ministrations, Perthian's breathing became heavy, his insides spasmed and sperm spilled from his vent, pouring into the bucket to fertilize Ketos' eggs.
A short time later, as Perthian dragged Ketos downstairs, he reflected on how lucky he was to have a Kismesis from the water breathing classes, it made things so much simpler for him. He carried the dazed troll out to his private dock, still tied up, and kicked the chair into the water. Despite her condition, Perthian was certain that he heard Ketos shout a number of curses at him as the tide swept her away
Glossary:
Kismesis- A type of romance and sexual attraction occuring among the Alternian Trolls from the webcomic MS Paint Adventures which is based on hate rather than love. Also refers to the object of such an attraction
Milt-the semen of an externally fertilizing species
Roe- unfertilized eggs of an externally fertilizing species
Notes:
This story is a rule 34 fanfiction about the race of alien trolls from the webcomic MS Paint Adventures: Homestuck. I noticed that they seemed a bit underrepresented. The story is based on the concept of Kismesis, an institution in the trolls' culture in which a romantic and/or sexual relationship is based on hate rather than love.
Ketos and Perthian's names are derived from the constellations Cetus and Perseus, respectively, following MSPA's canonical pattern of trolls' names being constellation related. The surname Liwyatan is derived from "leviathan". The surname Bher is based on a transcription of one of the root words of the name Perseus.
The mechanical details of Alternian troll reproduction are never explored in depth in MS Paint Adventures, but the offhand canonical refrences to buckets of genetic material strongly suggests external fertilization, and I don't find it likely that partners in a relationship based on hate would be keen on a breeding interaction that causes pleasure, or even which simply fails to cause discomfort, for their partner, so I devised the idea of trolls' bodies containing stores of gametes that spill out when the trolls are wounded in certain ways. In case it wasn't obvious, Ketos intended to do essentially the same thing to Perthian that Perthian did to her. The flecks of white that that flew off from Perthian when Ketos slashed him were drops of semen.