The Tragic Tale of Mark and the Septic Smile

Disclaimer:
I DO NOT OWN MARK OR JACK OR YOUTUBE OR ANY OF THAT STUFF

Just a quick, out there statement:
This story WILL contain smut, and WILL have a sad ending. There will be a warning before the smut, though, so you can skip over it. Also, there will be things like references to offensive topics, and you may feel triggered while reading this. Please feel free to skip over any paragraph like this, and continue reading when it seems okay for you.

IMPORTANT BACKGROUND:
This story takes place in an au set in modern times, but without youtube. Mr. Mark Fischbach is a teenager of 18 in Los Angeles, California. He's currently attending U-Tube University of Film and Entertainment.
About half way through the first semester, a young man from Ireland moves to America and happens to be attending this same University.
What will happen when they meet?
Only fate may decide.