sanemi was never good at showing love after what happened with his mother. He pushed everyone away and was often cold and angry. Not even his own brother could get close. That's why it was was an annoyance when you came along, a new hashira.

A nuisance to him who always persisted to stay around, even after all his cruel acts towards you. It confused him and trusted him to the very end. He'd stay up some nights thinking about why you wouldn't just leave him alone, and why you made him feel the way he felt. Why he'd get flustered when you were close and find himself wanting to protect you

one faithful day, he was training with the only hashira he can barely tolerate and a hashira he thought of as a self conscious prick. Iguro obanai and Tomioka guyuu. As their movements sliced through the wind, and thier nichrin towards clashed against eachother he couldn't help but see you nearby, watching them all fight. Wondering why you had to look so damn pretty, even when just standing there like an idiot.