You Think I'm Pretty Without Any Make-Up On

Blaine is co-captain of the Cheerios and lead-soloist of the Glee Club. Kurt is his crush.
Kurt is the unique boy with big dreams. Blaine is his crush.
The Unholy Trinity help Blaine to woo Kurt by leaving notes on his locker signed by B.

or

The one where Cheerio!Blaine has a crush on Kurt and leaves him notes on his locker.