[ PROTECTING HIS SISTER. ...LOOK, I KNOW IT REALLY DOESN'T SEEM LIKE A VERY WELL-THOUGHT OUT PLAN, AND YOU KNOW WHAT, YOU'D BE RIGHT. IT ISN'T. BUT IT'S HIS. ]

...you should at least make amends with him. [ If it didn't go well, Black's assuming it... did not go well, jesus. ] You're both going to be miserable if you wait for the other to say something first. With the way Mettaton is [ self-centered as fuck ] I doubt he'd be the first to step up to patch things up, so it's probably up to you.