Thank You, Come Again

Severus runs into the last person he expects whilst dining in London. What is Harry Potter doing, working as a waiter in Muggle London? Of course, the real question is: why can't Severus get the impossible jigsaw puzzle of the Boy Who Lived out of his head? Warning, Sev gets just a little stalker-y. SSHP Rated Kplus just in case. Little bit of language, but nothing bad.