SakuKarin

SakuKarin is the femslash ship between Karin Uzumaki and Sakura Haruno from the Naruto fandom.

Canon
Sakura and Karin first met each other during the mission to pursue Itachi but the two did not acknowledge each other. They did not formally meet until Five Kage Summit. Sakura was ordered by Sasuke to kill her if she wanted to join him to which she hesitated. However, it turned out that this was a ruse for Sasuke to sneak up on her so Kakashi saved her and ordered her to heal Karin instead of killing her.

While Sakura was healing Karin in a safe area, she felt pity and sympathy for her because Sasuke was willing to have both of them killed. Karin did not want pity and begged Sakura to stop crying because she was an enemy and thus should not be sympathizing with her. Sakura later introduced her to Naruto as a member of Sasuke's team but she denied this.

Years later, Sasuke was away from Konoha on a mission with Karin, and Sakura followed them during the process. Sakura eventually married Sasuke (and had sex with him) and was pregnant with his daughter. When she went into labor, Karin was the one to deliver her baby, Sarada. She also provided her with glasses as she had poor eyesight. Karin had also loved Sasuke but wanted him to be happy and was willing to help him and Sakura because of this.

Years later Sarada was in danger, to later meet with Karin and uses the Adamantine Attacking Chains to protect her. Later Karin tells Sarada to bite her so she can cure her wounds up, which she refuses since she knows it'll harm Karin, but she gratefully hugs Sarada and make her bite her arm, telling her that let Sakura know that "her debt has been repaid". This debt she was talking about it's when Sakura saved her years ago even when in those moments they were enemies.

Fanon
SakuKarin has a decent amount of popularity in the Naruto fandom, and is actually a very popular Yuri Couple from the fandom. Sakura and Karin were often considered to be rivals due to their love for Sasuke and the fact that they were technically enemies for a while. Some fans decided to ship them together because of or despite this because they felt that they would go well together. There is also the fact that both are medical ninja. SakuKarin rival SasuSaku, SasuKarin, and other pairings involving Sakura or Karin.

This couple is most likely supported due to both being the female teammates of Sasuke and both girls love him. They both share a very similar personality, as well as the habit of beating someone (specially their teammates) when they get annoyed. It's also supported for the fact that they are both healers in they respective ways.

Fandom
FAN FICTION
 * Karin/Sakura on FanFiction.Net
 * Karin/Sakura on FanFiction.Net

Trivia

 * Karin was immediately able to notice Sakura's feelings for Sasuke.