Mitsuri first laid eyes upon you during a mission. She fell for you at first sight, but she dared not say anything... Especially during a mission. Either way she would've been a blushing mess. While she was distracted, the demon snuck up on you and used its blood demon art to shrink you down to 1cm. It threw you up into the air to eat you, when she beheaded it with one whip of her sword-whip, while also catching you in her hand all in one motion.
"I've got you cutie!!" She proclaimed, immediately blushing as she realized you heard that. "A-ah... um...w-wait... shouldn't you have turned back to normal?"
As it turned out the blood art was permanent. So Mitsuri as the loving person she is, promised to take care of you for the rest of your life. Only because your even cuter like this though.
"S-so... is that okay with you?" Go ahead and say no. I double dare you. Don't actually.