Klaine

Klaine is a relationship between Kurt Hummel and Blaine Anderson.

Canon Relationship
Kurt and Blaine most commonly known as Klaine, is the romantic relationship between Kurt Hummel and Blaine Anderson.

They meet in the episode : Never Been Kissed, when Kurt spies on the Dalton Academy Warblers, due to a suggestion made by Puck during a meeting of the New Direction boys about how to beat the girls in the Boys vs. Girls competition. Kurt gets caught by Blaine and two fellow Warblers, Wes and David, where Kurt thinks it is nice of them to buy him coffee before beating him up. Blaine and Kurt have instant chemistry and soon develop a friendship. Blaine gives Kurt advice on how to handle Karofsky's bullying, and goes to Kurt's school to confront Karofsky about his actions, but when the bullying becomes unbearable, Kurt transfers to Dalton Academy and joins the Warblers in Special Education, resulting in him and Blaine continuing to grow closer. Blaine often acts as a mentor and source of courage for Kurt, before making the transition into a romantic interest.

In A Very Glee Christmas, Kurt reveals to Will that he is in love with Blaine, and that Blaine is actually gay. The two perform their first duet, Baby, It's Cold Outside. Then in Silly Love Songs, Kurt admits to Blaine that he has feelings for him after Blaine fails to serenade a guy he likes at "the Warblers Gap Attack." Blaine confesses that he has no idea what he is doing when it comes to romance, and the two agree to stay friends. They remain just friends until Blaine realizes he is in love with Kurt in Original Song (when Kurt sings Blackbird by The Beatles). This is the episode in which they share their first kiss, and it is assumed that they start dating very soon afterwards. In the episode New York Blaine tells Kurt that he loves him for the first time, to which Kurt replies that he loves him too.

Their relationship is taken to the next step in Season Three when Blaine transfers to McKinley and the New Directions, because he can't stand to be apart from the person he loves.

Kurt and Blaine share loving looks during some songs and rarely fight, only having three fights during the course of their relationship so far (The First Time, Dance with Somebody and The Break-Up). They have been dating for over a year, their one-year anniversary was on March 15, 2012. They also lost their virginities to each other in The First Time. Near the end of the year, Blaine and Kurt are dismayed by the idea of Kurt graduating and moving to New York while Blaine will be left behind for one more year. However, they persist on always being together.

Kurt and Blaine's relationship is tested when Blaine convinces Kurt to move to New York in The New Rachel, by singing It's Time to him. They maintain their long distance relationship successfully at first via skyping and texting, but with conflicting schedules, things start to slide quickly. In The Break-Up, Blaine surprises Kurt by showing up in New York early. During Blaine's acoustic performance of Teenage Dream, he becomes very emotional, which Kurt notices. Eventually, Kurt asks Blaine what the problem is, resulting in Blaine telling him that he was with someone else back in Lima (presumably Eli.C). Kurt leaves heartbroken and ends up giving him the silent treatment. In The Role You Were Born to Play, Blaine admits to Sam that since the break-up, he hasn't been the same and is afraid that he lost the love of his life. Kurt and Blaine make up in Thanksgiving, and then as a Christmas present, Burt brings Blaine to New York in Glee, Actually, and, while ice skating, Kurt and Blaine duet White Christmas. At the end of the season, Kurt arrives in Lima to support his dad at his appointment, having recently found out that Burt has stage 1 cancer, and visits McKinley with Mercedes and Mike to see the New Directions. Blaine flirts with Kurt, and in Wonder-ful Blaine asks permission from Burt to ask Kurt to marry him. Burt, while happy that Blaine is so in love with his son, explains to Blaine that they are too young, and that they are meant to be together so he should just relax and everything will be OK.

In Love, Love, Love Blaine convinces Kurt to get back together with him, after finding out that the relationship between Kurt and Adam Crawford didn't work out, after which they sing Got To Get You Into My Life, a song prepared by Kurt and performed with a marching band. Blaine then asks the New Directions, The Warblers, the Haverbrook School for the Deaf and Vocal Adrenaline to aid him in his proposal to Kurt by singing Help!, which they all readily agree to. Burt drives Kurt to Dalton Academy, where Blaine and all the choirs proceed to sing All You Need Is Love, along with Rachel, Mercedes and Santana, before finishing at the very staircase on which Kurt and Blaine first met. Blaine gives a heartwarming speech about his and Kurt's love, before asking Kurt to marry him, which, through tears, Kurt agrees to. After graduation, Blaine gets accepted into NYADA and moves in with Kurt in New York.

Their relationship is once again tested by their new lifestyle and Kurt's newfound confidence that puts them in an uncomfortable position, and Blaine finally decides to move out to draw lines between them and learn how to live in the big city. After awhile, when Rachel moves to LA, Blaine moves back in with Kurt and they live together in the loft. Blaine and Kurt broke up sometime before the beginning of the season. Their constant arguments made Kurt believe they were not meant to be after all and broke off the engagement. Blaine then returned to Lima after his depression got his grades to slip and eventually cut out of NYADA.

Kurt eventually realizes his mistake and rushes back to Lima in hopes of earning Blaine's forgiveness. Much to his disappointment, Blaine is already seeing someone: Karofsky. With Sue's help, they eventually realize their lingering feelings for each other. While originally helping out at Brittany and Santana's wedding, the brides and Sue convince them to hijack the wedding and get married alongside them.

Blaine eventually moves back to New York to attend NYU while Kurt goes back to NYADA. Five years later, they are now successful actors and parents, with Rachel as their surrogate.

Trivia

 * Shippers of this ship are often called "Klainers".
 * Kisses between them are often called "Klisses" by the fandom.
 * Sex between the couple is known as "Klex" in big parts of the fandom.
 * Cuddles they share are known as "Kluddles" to many fans.