My sister's obscene mouth and ugly throat are dedicated to me

Her sister, saya, is treated as a real woman. Because I had a younger brother's partner several times in the past, it was related to zizzuru every time. It is saya who really wants to end this relationship, but because it doesn't know what to do if this younger brother is made angry, it continues the relation without stopping. In the absence of her parents today, she was put in the throat with a hard Chio Po in her throat as her mouth.