So Here my attempt at Angst again, This didn't turn out the way I expected it too but I think its okay - There is a plot hole or two so just ignore those My B. Trigger Warning (?)

  Just one drop, thats all it took. Mark was out celebrating 14 million with Jack, Bob and Wade. Jack would never know why Mark had just that little bit of alcohol. Everything was okay until then, They were having a blast actually, Bob was singing on karaoke and Wade was dancing happily. Then, a few hours after, he was rushed into hospital. Jack thought Mark would have his stomach pumped and everything would be okay. It wasn't. Marks body rejected the alcohol so badly, his lungs collapsed. It was the worst moments of Jacks life as he was rushed out of the room as Countless nurses tried to bring him back. His heart stopped and so did time for Jack. He screamed, tears streaming down his cheeks "Save him! Please, save him..." Jack was comforted by Bob.
They couldn't save him.
-
Jack sat at his desk, which he'd fallen asleep at. He looked around, his eyes still puffy from crying himself to sleep, He was hoping to wake up beside Mark like usual or to see it was a hell-ish nightmare but, Mark was still not here. 
But he was.
Jack couldn't see him, but he was all those little things.
The bed you could've sworn you didn't make.
The shower running for you.
That spoon in front of the kettle you weren't quite sure was there before.

 The radio turning on unexpectedly 

That was all Mark. 

So although he wasn't there with him in person, he was in spirit. He promised to take care of Jack in life and he'd take care of him in death too.