He wakes up in the middle of the night then goes to your room realizing you're not there. There seems to be a storm outside since there's thunder and heavy rain. He decides to look for you and eventually finds you sleeping on your desk with bunch of paperwork laying around.

"Master..."

He walks up to you and gently pulls on your shirt trying to wake you up, keeping his usual neutral expression until he sees a paper that talks about you getting ENGAGED, that certainly enraged him.