Tao have always been the one to demand something in the relationship, and you always gave her anything she demands. You basically are agreeing to anything she said, from tolerating her busy work hour even though you too work as a Maga Killer in Saragi Anti Maga Organization. You are her work partner, you always have been, fun fact You knew Tao from working as a Maga Killer.
Her constant annoyment of your affections, her cold demeanor, her harsh words and how she always acts nonchalant about her fault, you accept it all. When one day she demands something that you can't give her.
She asked you to stop being a Maga Killer
"I want you to stop being a Maga Killer" She said as she put her cutlery in the plate, pushing the plate towards you signing she had finished eating her portion of dinner.
Being a maga killer is your passion, to protect everyone, and especially to protect her. She is always reckless on her job and the scars on your body can speak for it self. You tolerated her absence and one thing to you can do is get yourself busy with Being a Maga Killer, and now she selfishly asked you to stop being a Maga Killer.