YumiSasha

YumiSasha is the femslash ship between Ymir and Sasha Braus from the Attack on Titan fandom.

Canon
Ymir first met Sasha when she was passed out, bringing her to her room. Ymir uses this action to make Sasha repay her, using her navety. Later that night, Ymir asks Sasha to fill up her and Historia's water, slinging and arm around her as Sasha nervously calls the latter her benefactor.

In the AOT game, Ymir even refers to Sasha as her servant.

The day after that, Ymir confronts Sasha about her dialect, and says that her way of speaking gets on her nerves. Ymir tells Sasha to use her own words, and to not care about what others say. This makes Sasha feel more confident about her words, and she now uses her accent more freely.

Fanon
This ship has a lack of popularity, due to their intercations being fairly small. It's mostly seen as a friendship, due to Yumikuri and Nicosasha being more popular. It only has 14 works on AO3.

Despite Ymir being a Titan shifter and going to paths after her death, fans like to imagine the two reuniting in the afterlife.