Author: Djibriel
{oOo}
This day had started fairly well, actually. Mortarion had woken up, made his greetings to beloved Papa Nurgle, and gone to gloomily contemplate the picture of his little sister. Poor, innocent Hotaru. She'd never deserved what his foolish father had done to her... Horus was right, if only for that. The corrupted Primarch clenched his fist in rage, simmering it to a fine boil. Better not to waste it. There were Ultramarines to corrupt and slay, after all. Stupid Roboute. If he'd only listened when Mortarion had tried to tell him what was going wrong, Maybe Mortarion would never have had to...
Never mind. The past was the past. The corrupted Primarch gloomily went off to do his duties.
Some time later, he was quite surprised when he heard a few angry minions of Khorne complaining about a recent defeat on Hades VI. The words that caught his attention in particular were "Slip of a girl."... "Obliterated an entire block of the city.."
...It couldn't be, could it? Hope began to seep into him like pus in spite of his attempt to rationalize it away. Cornering one of Khorne's followers later, he began to question him, discovering to his incredulous joy that his sister was awake.
Of course, that was later converted quite quickly into a rage when he was informed his little sister was attacked by a Bloodthirster.
Mortarion was not happy. Khorne would pay for this!
...At least that Commissar fellow had made himself useful by putting himself in between the thing and his sister as often as possible. Maybe he would spare the man? Hotaru might like that...
...What was his name again? ...Cain?
Some time later, after finally getting his internet connection fixed and getting a hold of as much information as he could, the corrupted Primarch sat down to try and relax, feeling sure that the day was going to be absolutely wonderful.
How wrong he was.
As he read more and more of the files, the corrupted Primarch stared in growing disbelief at the information he found. On one hand, this Cain was a hero, a kind and caring commissar to his men, always ready to protect the innocent.
On the other hand...
...He had bedded more females than Mortarion had appendages. And given Mortarion belonged to Nurgle, that was saying a lot.
That pretty much killed any respect the Primarch had for him.
A mounting fury began to boil through Mortarion's veins as he got to the papparazzi-taken pictures of Cain with his sister. The rumors of their ongoing relationship. The many iconic pictures of them together.
One in particular set an incoherent roaring red fury hazing his vision, but regrettably not obscuring the sight Mortarion wished he'd never seen.
His innocent, little sister. In a man's bedroom. While that Cain... was half naked. And the Commissar in question was known to have affairs with many, many women, even as he was in a relationship with his sister. The Primarch was utterly horrified by the picture. He knew the look in her eyes, oh yes he did. He'd seen that look in Azmina's eyes plenty of times.
His innocent little sister... had a crush on a... casanova.
The resulting incoherent rage was passed on, through Papa Nurgle's gifts, to every single Plague marine ever blessed by Mortarion's geneseed or corrupted by one of his plagues.
Three days later, every single plague marine in the galaxy gained the urge to beat Cain into a pulp.
Cain soon found this out after they began targeting him on the battlefield, turning away from their original objective at the sight of him, or the sound of his name.
After eight horrible, mentally traumatizing encounters from which Cain emerged victorious, the Imperial Guard began calling him Nurgle's Archenemy*.
Khorne was not pleased.
*and other derivatives thereof.
{oOo}
AN: A bit of silliness based in Arkado's continuity, also connected to the last two drabbles by Bloody Mary.