This story begins with Aria doing consensual BDSM roleplay with her friends, who are treating her as their "pet". It starts out as a mix of silly and sexy. But as the day goes on, she begins to have ugly, violent thoughts about herself. Her friends stop the scene when they notice that she is no longer having a good time. The three of them discuss what happened and Aria's friends reassure her that she is valued.
Aria is treated as if she is inferior and subordinate to her friends, in both subtle and overt ways, up until the final scene where their roleplaying ends. The final scene makes it clear that this treatment was performed at Aria's request, and doesn't reflect their actual feelings about Aria.
The interactions between Aria and her friends are consensual, but in the scenarios that Aria imagines internally, it's not clear whether her "imagined self" is consenting. However, since Aria is just picturing these scenarios in her head, her consent is never actually violated by another person in this story.
Here are some specific events from the story that may be upsetting.