lol wrong account
Seamus was definitely not expecting to have to do anything the morning after agreeing to drink with Dean. And they had quite an interesting night, so he had planned on calling off of work sick the next morning and just sleeping all day. Till an owl came pecking at his window with a summons from Snape to the castle, most likely to interview for the Transfiguration position.
So instead of sleeping all day, he drug himself out of bed, cleaned himself up, and took a hangover potion (since his head was POUNDING). He decided to floo into Hogsmeade to try and avoid any apparition sickness along with the hangover.
The potion had kicked in as he was walking up the trail to the castle. Being back was a bit surreal, since the last time he was there he was still technically a "student," taking his NEWTS so he could finish training with the Ministry.
Before he knew it, he was outside of the Prof...Headmasters office. He politely knocked on the chamber door to announce his arrival, then let himself in. "You wanted to see me, sir?"
Seeing Snape sitting in that chair made him feel like he was back in school, being summoned to the dungeons for not finishing his Potions assignment.