It would not only make you seem that you've actually paid attention to your partner's interests, plus it would probably be one of the very unique greetings ever presented.
So here are some greetings that would sweep your bae off their brooms this valentine's day
Whichever suits ya!
You gotta listen to the Dark Lord.
Who needs the Room of Requirement when you can snuggle muggle style!
He can be romantic too!