I'll stay (darkiplier versus Markiplier, Markiplier x oc)

This is a Darkiplier Versus Markipler and a Markiplierxreader so I hope you enjoy!! Your name is Sierra you and Mark have been friends for a long time and dated in high school for 5 years then something happen making Mark into Dark and you wanted to stay but he wouldn't let you so you left then Mark calls to ask you something and he asked...... You would have to find out