Prompt: "I'm sorry. I didn't know."
When Todoroki tells her about his family, Yaoyorozu honestly doesn't know how to respond. She'd been talking about her own family, and how her mother wanted to meet her… friend (there's not a better word for it, because they're not technically dating, but they aren't not dating either), and she'd asked if he thought their mothers, would get along, because that was something mothers were supposed to do.
"My mother's in the hospital," he says bluntly. And then the story of why she's there and how Todoroki got that scar on his face and the entire reason for his existence comes pouring out.
"I'm sorry. I didn't know." The words sound empty, but there's really nothing she can possibly say to change this situation. Todoroki simply shrugs and returns to his lunch. There's no obvious pain on his face, but she's almost completely sure he's hurting inside.
When she finally meets his mother in the hospital - a woman who clearly shouldn't be there, but is probably happier where she is than where she was before - Yaoyorozu realizes that Endeavor is probably the person she hates most in the world, and she can't understand how or why someone could take two beautiful people and hurt them so badly.
But for now, she simply slides her hand into his, entangling their fingers, and lets him lean his head against her shoulder because it's the best she can do.
For now, at least.