People don't so much establish key of D# major, AGAIN, for the simple reason it exceeds circle of fifths and 7 sharps, by two. Fx, Cx.
You will not find 'Sonata in D# Major' in this dimension on this planet because it's more trouble than it's worth.
It only gets brought up by people on the internet whose entire experience is the piano roll which displays only sharps. It's not really a thing. You could wind up there with those seven notes if you've gone rather amok but as a key, do the other thing. People will hate you,
