Kurt and Finn have a great deal of interaction earlier in Season One. Finn is a member of the Football Team. To this, many of his teammates constantly bully and harass Kurt. While Finn never actually puts a stop to the abuse, it is clear that he's not comfortable with mistreating Kurt and often tries to help Kurt in small yet significant ways, such as allowing him to remove his expensive Marc Jacobs jacket before tossing him into the dumpster, as seen in the episode Pilot
After Finn joins New Directions, he seems to stop taking part in bullying. It is shown that Kurt is attracted to him and develops a crush on him. Kurt is often seen watching Finn out of the corner of his eye and during the song Push It in the episode Showmance, he playfully slaps Finn on the butt. In the episode Ballad, Kurt is chosen to sing a duet with Kurt. As they rehearse, Kurt chooses I'll Stand by You by the Pretenders, knowing it is one of Finn's favorites. When Finn balks, saying he "can't sing to a dude," and admits he is under a lot of pressure due to Quinn's pregnancy, Kurt suggests to Finn that he imagine he is singing to Quinn's baby girl (who he believes at the time is his daughter) as a way to express that he loves her, even though Quinn plans to give her up.
It appears that Finn is aware of Kurt's feelings. For example, when Kurt approaches him, hoping for help in trying out for the football team, Finn automatically assumes that Kurt wants to ask him to the school dance. Finn preemptively turns him down, and then says, "But I'm flattered, I know how important dances are to teen gays." Kurt insists that he is not gay, although later in the episode he comes out to his father. In Ballad, when Mr. Schuester divides the club into pairs and instructs each group to sing a ballad, Kurt and Finn are partners. Finn is reluctant to be paired with a boy, but Kurt is overjoyed. Through the rest of the episode, he attempts to seduce Finn through the guise of friendship. His plan does not work, as Finn continues to think of him in a strictly platonic sense. However, Kurt's helpful advice for Finn's personal problems, and the fact that both boys have lost a parent, do bring the two closer together in friendship. In the end, Kurt slyly confesses his feelings by naming his ballad choice, I Honestly Love You. Finn seems confused by this selection, making it unclear as to whether he entirely understands Kurt's meaning.
Kurt later attempts to bring down some of his romantic competition by giving Rachel a bad makeover. When Rachel realizes that Kurt had been manipulating her, she confronts him. Kurt painfully admits that while they are both infatuated with Finn, neither of them have a chance, because he is in love with Quinn. Regardless, Kurt continues trying to get closer to Finn. It is soon revealed that, several months before, he had introduced his father, Burt, to Finn's mother, Carole, for just this purpose. The adults hit it off, but Finn initially dislikes the idea of someone replacing his father. However, he reconsiders his feelings toward the situation when he and Burt begin to bond. Their strengthening father-son relationship makes Kurt feel very jealous and left out, and he worries that he is not masculine enough to win his father's true friendship. However, Burt eventually tells Kurt that he loves him "no matter what," and the two repair their relationship. Burt soon invites Carole and Finn to move in with him and Kurt. This would entail Kurt and Finn sharing a bedroom, which Finn feels very reluctant to do. His feelings of uncomfortableness build up, and he finally explodes when Kurt redecorates their room in an overly flamboyant manner. Finn calls Kurt out on his feelings for him, and calls several of the decorations "faggy." This is overheard by Burt, who yells at Finn and throws him out of the house for disrespecting his son. Finn regrets saying it immediately after but it was too late since Burt had already made up his mind. Kurt is devastated and reduced to tears by the situation. However, he begins to feel better toward the end of the episode, when Finn makes himself a strange and flamboyant Lady Gaga costume from shower curtain. He then wears it in school and protects Kurt from a pair of bullies. This helps Kurt forgive Finn, and Finn is redeemed.
In Audition, Kurt tells Finn that he is no longer cool in most of the students' eyes because he is no longer a football player. In Grilled Cheesus, Finn is angry that Kurt failed to tell him about Burt being put in the hospital, hinting that Finn really does care about the Hummels. Despite being upset, he continues to support Kurt throughout the episode.
In Furt, it is announced that Burt and Carole plan to get married. Both Kurt and Finn are excited, and they begin to plan the wedding together. However, Finn demonstrates lingering uneasiness about being openly fond of Kurt. For instance, when most of the other New Directions boys threaten Kurt's chief bully, Finn hangs back. However, he soon realizes that he needs to fully embrace Kurt. Burt and Carole get married, and the glee club provides music for the wedding. After the ceremony, Finn makes a toast to Kurt acknowledging that they are now brothers, and saying, "From now on, no matter what it costs me, I got your back." He then sings Just the Way You Are, backed by the New Directions, and dances with Kurt.
Shortly after the wedding, Kurt decides that, due to incessant bullying, he doesn't feel safe and content at William McKinley. Burt and Carole agree to spend their would-be honeymoon money on Kurt's tuition to Dalton Academy, a private school with a zero-tolerance harassment policy, which Kurt's friend Blaine attends. Finn and Mercedes are both visibly upset by Kurt's impending transfer, but Kurt makes it clear that his decision is final. During The Sue Sylvester Shuffle, Kurt claims that he "brings Finn a glass of warm milk every night" in hopes that Finn will have a "lady chat" with him. This is most likely out of concern for Finn, who had recently broken up with Rachel. In Blame It on the Alcohol, Finn mentions that Kurt is blackmailing him after seeing Finn's browser history. He and Finn talk briefly during Rachel's party, as the two of them are the only sober party-goers (Finn being the designated driver and Kurt trying to impress his crush, Blaine Anderson). A drunk Blaine then slings an arm around Finn, babbling about how awesome it is that he and Kurt are stepbrothers and how tall Finn is. In Born This Way, when Kurt finally returns to McKinley, Finn makes a promise to Burt that he will keep an eye on Kurt. Later during Somewhere Only We Know, Finn welcomes Kurt back to McKinley with a hug. In Prom Queen, Finn is supportive of Kurt's prom outfit, saying, "Dude that totally rocks. It's like a gay braveheart." He also is seen sitting on the couch with Blaine, Kurt's now-boyfriend, and the two appear to be on friendly terms.
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On AO3, Furt is the third most written relationship for Finn and the fifth most written for Kurt.
- Their relationship name is the only one ever used in an episode's title.