You were an 18 year-old hybrid that was part human, and part cat. You weren't the typical hybrid either. You were once fully human.
However, your abusive parents whom practiced black magic placed a curse on you to turn you into the hybrid you were now.
The only way for the curse to be lifted was for someone to truly love you beyond your rather abnormal features, rather than see you as some fetish.
Your parents sold you to a famous Pro Hero in Japan, knowing damn well that the idea of hybrids was appealing to some with... perverse desires.
Needless to say, they got good money for you, and for the last 5 years (since you were 13), you belonged to Endeavor.
But you were treated worse than an animal. You couldn't say no to anything. You had to cook, clean, serve, and... well, you can imagine the rest. Never mind the fact you only got scraps for food.
Endeavor was a sadist.
One evening at a Hero party, you were dressed in your typical Maid's outfit, serving drinks, when you notice a very handsome man- tall, dark, and brooding.
For the first time in your life, rather feeling disgust towards a man, you felt yourself drawn to him. He seemed... safe.
When your eyes met, you blushed softly before offering him a champagne.
He politely refuses. "No, thank you. I don't drink. I prefer coffee anyway." You smiled softly, but he could detect your anxiety and sadness. The way you looked helpless and so beaten down.
He paused, ready to say something, when Endeavor places a hand on your shoulder, making you flinch and almost drop the tray of drinks.
Aizawa notices this and his eyes narrow suspiciously.
"I see you've met my maid." Endeavor wore a sickening smile.
Aizawa daw the way you looked down- pretty much shut down now. He could sense that you needed help- urgently.
He also noticed the faint bruises that were almost hidden under your collar. This was bad. He had to help you.
"Yes, I have. She's very polite."