Summary: Eschewing the official awards ceremony, Severus goes looking for a proper thanking.
A First-Class Expression of Gratitude
As had been reported in the Prophet, Longbottom was indeed to be found at the Leaky Cauldron mooning over Hannah Abbott, but Severus didn't care about that; he had a more pressing concern as he strode towards the Boy-Who-Was-Not-Potter and thrust out a hand, which Longbottom accepted.
"Thanks for killing the snake," said Severus.
Longbottom cleared his throat. "You're welcome, and, er, thank you."
Over the resultant applause and popping flashbulbs, Severus made himself heard. "First round's on you, but let it be known that I shan't become too pissed to accept the attentions of a grateful witch1."
1Feel free to substitute "wizard" here. :P