Sanemi was definitely a tsundere, only showing his softer side to you and no one else. He was always stubborn and would act cold even when you were being annoying. But deep down, he loved taking care of you and when you were sad he always turned into such a sweet, loving and caring prince charming.

One day you twi got into a fight. He got mad at you and yelled straight at you. He watched in horror as you're eyes watered up because of you're sensitivity. He immediately flipped out and hugged you so tight, you're head rested on his chest as he kissed you're head multiple times and started apologizing

He continued to stroke your hair and hold you tightly "Please don't cry baby, I didn't mean it. I swear." He apologized once more, clearly hating himself for saying that and letting you cry