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A Farewell to Undercroft

Summary:

He meant - means a lot to us both. I hope we get the chance to tell him that one day.
A post-Azkaban story of Sebastian and Ominis, they reunited 5 years after game timeline.
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In the ice cold darkness, Sebastian Sallow used his bony fingers - mere insignificant marks from Azkaban - to grip the throat of his former friend.
"How could you leave me? How could you sleep at night knowing I'm there?"

Chapter 1

Notes:

(See the end of the chapter for notes.)

Chapter Text

Something wet and icy splashed onto his face.
But the cold touch did not repel Ominis; it even brought back some distant faint memories that made him a little nostalgic. He stretched his arms out and groped around, in a search for his wand, but all he touched was more cold, fluffy stuff.

Ah, it's snow, he thought to himself.
The sound of the wind in the distance was barely audible, and all he could hear was the soft pitter-patter of snowflakes falling on the treetops. It seemed like a peaceful snowfall, not a blizzard, and Ominis felt his whole body warm and relaxed as his heart beat calmly against the ground.

Was this the Forbidden Forest?
Why was I here? What did I want to do?
A faint confusion arose within him, but the inertia that had grown within him in such comfort held back the thought.

As long as I stay here, just a little longer, then...

"Just a little longer for what?"
The abrupt voice made Ominis' heart skip a beat, but he quickly recognized the source.
"Sabastian, you almost murdered me."
The accused boy chuckled without any remorse - even though Ominis couldn't see it, he could imagine the smirk on his old friend's face - a side effect of three years of being inseparable.

"But, Ominis, what is it that you want?" The familiar voice turned serious and alien.
The question caught Ominis off guard. Something within him started to shatter, destroying the calm in his heart. Then he realized he was lying on the surface of a frozen lake all this time, which at this moment was being broken into floating pieces of ice. He panicked as he heard the cracking sound, and he thought he was about to fall into the eternally dark and cold abyss underneath.

"I don't know what you're talking about, Seb-"
Something flipped.

The next thing Ominis sensed was the charring heat that came rushing towards him, the formerly cool and peaceful air around him becoming heavy and stifling.

"Ominis, it's what you want too, isn't it?"
Sebastian's voice came through his ear, and the 15-year-old's ears turned red immediately.

Ah, he was back in Undercroft, again. The table that supported his entire weight was causing his back to ache, but the pain was a secret pleasure to him. Ominis wrapped his arms tightly around his former friend's body, as if trying to hold onto the only straw in a shipwreck.

His mouth had never been so dry that he couldn’t help licking his own lips, and his breath became hotter and hotter, shorter and shorter, with every touch he sensed. His shirt unbuttoned, hanging messily on the table, his skin was exposed to the air, but his body was suffused with a feverish shade of rose, and his heart was burning like it was being seared.

Ominis didn't have the mental capacity to answer the question Sebastian whispered to his ear, he could only drain up all his strength to pull him closer, and closer. The sweat of the two 15-year-olds mixed on their skin, exchanging the heat named adolescence. Sebastian's body temperature was almost burning him, and even if he were incinerated into ashes at this moment, it would be worth it. His fingers wandered from Sebastian’s face, then shoulder, chest, greedily touching every inch of Sebastian's skin, as if it were the end of the world - and maybe it really was. So, he pulled Sebastian closer with his tie, and brought his lips to Sebastian's, like a moth to the fire.

However, the texture of the school uniform tie in his hand suddenly became as heavy and thick as the Veil, radiating a solemn and pressing aura. The moaning of the dead grew closer and closer in the meantime, until it completely fell down, almost suffocating him.

"No, no-"

Startled awake from the nightmare, Ominis wanted to scream, but not a single sound managed to escape from his mouth. The sticky fabric of his sweat-soaked pyjamas clung to his body, but compared to the other unpleasant sensations, it was inconsequential. The first thing he realized after gaining his consciousness back again was that, he was being choked.

Pure malice and hatred stared at him. Ominis trembled uncontrollably, even though he could not see, guilt and fear was consuming his sanity like a hurricane sweeping across the field.

In the ice cold darkness, Sebastian Sallow used his bony fingers - mere insignificant marks from Azkaban - to grip the throat of his former friend, the skin of which felt silky compared to his hand covered in warts and wounds. Warm veins were running under the skin, supporting the life that had brought so much pain to him. His shoulders rose and fell with heavy breaths as he towered over Ominis, who was defenseless under his control. If he wanted it, Ominis was easily at his disposal for revenge.
The young man’s glass-like eyes were reflecting the dim cold moonlight outside, which was unseasonably beautiful, luring Sebastian to lean down towards him. He exerted more strength to his neck, bending down like a werewolf about to transform, growling hoarsely into Ominis' ear.
"How could you leave me? How could you sleep at night knowing I'm there?"

Ominis turned his head aside. Every word from his former friend left a deep piercing pain in his heart, but he was hiding more than just fear. His cock was embarrassingly erect at the moment. Ominis shamefully closed his eyes, but the images from his dream still lingered in his mind, overlaid with Sebastian's figure and that of his 15-year-old friend. Stop, shut up, he cursed himself in his mind, at the same time struggling and writhing to hide his pathetic arousal.

But it was an unfruitful attempt, as Sebastian's tone suddenly turned mocking. One of his hands left Ominis' throat, mercilessly gripping his erect cock.
"Does it feel good, Ominis? Was it worth it?"

The string of his taut sanity snapped suddenly.

The next second, Ominis only knew that the weight on his body had disappeared, and the sound of Sebastian slamming against the wall. He didn't even have time to grab his wand before he stumbled into the bathroom. His hands trembled uncontrollably, as the sharp edge of the lock cut his fingers, but he couldn’t care less about the blood. He kept fumbling for the lock's position, until he finally locked himself in successfully.

A long sigh escaped.
The night seemed never ending. If only this was the last night on earth, Ominis thought to himself in despair, as he slowly slid down to the freezing cold floor, leaning against the wooden bathroom door.

Notes:

I headcon-ed Ominis started working in the Department of Mystery after graduating from Hogwarts, and there's subtle hint about that in this chapter. His work is not super important to the story, but just imagine Ominis standing in the middle of shelves of crystal prophecy balls ^^

The two lines from adult Sebastian is provided by our friend Alexa, it really inspired me to write the choking scene!