Punishing the Best Body-Smelling Sister

My roommate is a bitch who knows she has body odor and is proud of it. One time after I went to the toilet, I saw her grabbing my rice and sticking it to her armpit. I was disgusted and angry, scolding her for being such a psycho. Unexpectedly, she was very proud, as if I had taken advantage of it: "This is the fragrance of a girl, what do you know?"