Complete?
Seamus flashed a mere shadow of his usual mischievous smile when Dean cottoned on that the hat was clue. "Maybe," he said. "Or maybe not." He had given Dean red herring presents before, but that had mostly been while they were still at school and Seamus had all the time in the world to track down cheap, suggestive-but-irrelevant presents. Nowadays he wanted to give Dean things he'd actually keep, not little trinkets he'd throw away in a few months when he couldn't remember why they were funny.
"I'll be there," he said, not consciously aware of the fact he didn't actually confirm that Dean would see him. He paused, twirling his wand in his hand for a moment. He didn't want to leave. He didn't want to say 'enjoy the rest of your birthday' like he wouldn't be around for it. His desire to stay, to actually be welcome and wanted and not just an annoyance, was almost overwhelming - so Seamus did what he did best. He apparated back out to his living room, chest feeling empty as he hurried down to the Roost to supervise Dominic's final transformation.