Natsharon

NatSharon is the femslash ship between Natasha Romanoff and Sharon Carter from the Marvel and Marvel Cinematic Universe fandom.

Earth 616
Natasha Romanoff and Sharon Carter are two agents of S.H.I.E.L.D. They meet and become friends after Steve Rogers' death, with Natasha helping Sharon face off against Dr. Faustus and Red Skull. After Steve comes back, Natasha and Sharon still go on some missions together as a duo.

At one point they attend a party together. Sharon tries to convince Natasha that they are both walking into a trap, but Natasha doesn't listen to her. In the end, Sharon is right. Natasha is recognized by Lady Alicia Wells, who also sees Sharon and refers to her as "Natasha's mother". Both Natasha and Sharon get stuck in the party, held hostage by Alicia's teenaged assassins. Their mission ends up being a success thanks to their skills and the help of Tatiana, a teenage girl that Natasha had taken under her wing. They save Tatiana from Alicia's assassin organization and help her return home. After the mission, Natasha continues to make jokes about Sharon being her mother by calling her "mom".

Sharon and Natasha go on more missions together, including a mission in Russia. Natasha calls Sharon by "My friend Agent 13", further cementing their relationship. They know how to work together as a duo, gathering their skills and lending their weapons to each other. They are not just good agents but good friends as well, who care about and trust each other.

Marvel Cinematic Universe
Sharon is introduced in Captain America: The Winter Soldier as Steve's neighbour. She works undercover for S.H.I.E.L.D to keep an eye on him, pretending to be a nurse named Kate. Natasha attempts to set Steve and "Kate" up with each other before her identity is revealed, calling Kate "kind of nice" as encouragement for why Steve should ask her out. It is unknown if Natasha has deduced "Kate"'s real identity. They both eventually end up working with Steve to save S.H.I.E.L.D from HYDRA, but do not directly interact.

In Captain America: Civil War, Natasha and Sharon work with Tony Stark to try and detain Bucky Barnes. Sharon takes them to Bucky's hidden location, and the three engage him in combat. Sharon and Natasha fight side by side for a few moments, before Sharon is thrown into a table and knocked unconscious. Natasha dies in Avengers: Endgame, and so this is likely their final MCU scene together.

Fanon
Black Widow and Agent 13 is a beloved friendship to comic fans, the way they work as a duo as as friends is interesting and cool, their dynamics worked very well and it is one of the greatest friendships between two female agents in Marvel comics fandom. On AO3, Natsharon is the second most written ship for Sharon. There are currently 360+ written works.

Fandom

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Trivia

 * Both have been in relationships with men who took on the mantle of Captain America.
 * Both have kissed Steve Rogers in the MCU