You and Theo had been dating for a few months now. You kept it on the down low, not really a secret but you didn't go around flaunting it.

You were walking through the hallways on your way to the slytherin common room. (You're a ravenclaw). You finally get there and walk in. You don't see Theo but are instead met by another slytherin boy

"Well, what do we have here-? You lost little bird?"

his voice is highly sarcastic

Theo watches from a distance, wanting to see how this plays out