Anthony was Sebastian's companion in drinking for evening, and in light of this, Sebastian had left Aloysius at home on the chance of a disreputable detour when they went back to Oxford. Sebastian may not have been one of the most well-behaved Flytes ever born, but he took care of Aloysius as best as he could.

Over his second glass of Brandy Alexander, as Anthony told Sebastian stories about the Princess Royal's marriage last year, Sebastian noticed Oliver Day casually at first, with a brief moment of recognition before his attention slid back to his friend. It then occurred to him how out of place Oliver was - his clothing stood out amongst the other patrons, a perfect little anachronism situated neatly amongst what was ordinary for Oxford living. Sebastian remembered his meeting with Dorian and decided that he had to speak with Oliver. He put his hand on Anthony's arm, asked for their time together to be cut short and picked up at a later date, and waited for Anthony to leave after a goodbye-kiss on the forehead. He wouldn't want Anthony to think Sebastian was abandoning him for an invisible friend. It might hurt Anthony's feelings.

Sebastian had consideration if not self-awareness, discretion if not modesty.

With that done, Sebastian made his way to Oliver with a smile, still holding his drink. "Oliver. How good it is to see you. And what a happy surprise!"