So many firsts and so much controversy ... welcome to "The First Time." McKinley High is tackling West Side Story ... and some of our favorite students are wrestling with taking their relationships to the next level. Yes, Rachel and Finn and Kurt and Blaine go there, and it's all tastefully done. Plus, Artie succeeds as a musical director and has his first voiceover. Kevin and Jenna have all the behind-the-scenes dirt on this episode of many firsts!