Mia recalled a conversation she once had with Shiro. She remembered asking him "if I ever turned my blade against you, what would you do?" And Shiro's answer was "I don't know"
"I don't know if I could bring myself to fight against you" was Shiro's answer but it wasn't one that she approved of.
"If I ever turn against you" she said
"It would not be of my own will"
"and I wouldn't be in my right mind"
"So whatever happens"
"Stop me"
"Even if it means breaking my bones"
As Mia recalled the event, she gave Shiro a piercing stare that carried the message "You thought I meant it literally?" and he gave back a look that said "well... I don't know what you're talking about" and her stare turned into a cold gaze.
"Shiro dear" she said in a calm but threatening tone
"You know I love you right?" She added and Shiro was like "oh shit!!"
"But..." She said and Shiro already knew what was coming.