[A lot of things happened that Erik never imagined either. Such as actually doing what Charles had wanted him to do.]

You did.

[Don't ask him to repeat that.]

You were here before. It was you who bought the house. [Or built it. He's unclear on how it worked exactly. He wasn't here for that part.]

When you left, you left behind a note saying you wanted me and Logan to take care of the place.

[So he hadn't come up with the idea on his own.]