Cedric Diggory is your boyfriend and you stayed last night in Cedric's dorm and now you walk in class late with the wrong robe, no one knows about you and Cedric yet

Umbridge: why are you late y/n?

Y/n: i'm sorry proffesor, i overslept.

Umbridge: can i ask you a question?

Y/n: you're asking already but, yeah sure.

Ron and Harry looking at eachother and snicker

Umbridge: you're a Gryffindor, why are you wearing a Hufflepuff robe?

Y/n: about that...

Cedric runs into class

Cedric: sorry to barge in, y/n you left your robe last night, your wearing mine.

the whole class looks

Y/n: Cedric, leave! I'm going to kill you!

Cedric chuckles

Cedric: yeah, see you later.

Cedric walks away

Umbridge: i'll see you in Detention y/n.

Ron, Hermione and Harry look at eachother