A secret between my friend's mother and the two of them. Forced sex with an auntie inside her...

"Yuki-san, isn't it? I'll never tell anyone..." Ishikawa, who came to visit Nanao's classmate, Nanao's house, admired Nanao's mother, Yuki. On this day, Ishikawa was so worried about Yuki that she secretly left her room to check on her. And then I learned about Yuki's secret. Ishikawa impulsively behaves in obscene ways...