Based on how CrissColfer are complete nerds and love everything comic-con-esque. Kurt and Blaine meet at comic-con. They bump into each other when looking at Harry Potter merchandise and get talking. Things spiral from there. Klaine. Kurt/Blaine
A few days before Valentine's Day, Puck teaches Kurt the meaning of flowers and reveals something in the process."It's a Gardenia and um...Wikipedia says it means I'm secretly in love with you." -Season 3, Oneshot