My cousin came to stay in the middle of the night and secretly stripped her sister

My cousin came to my brother's house to stay for a few days, then in the middle of the night he continued to secretly touch my brother's body, but it seemed like my cousin knew but still pretended not to know anything. Every day I dress up in more and more sexy pajamas to provoke my brother to continue, and then until he takes off my underwear to put her in…