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

Takagi, who had come to visit her classmate's house, had been fond of her friend's mother, Rika, since she was a child. Takagi is so concerned about Rika, so beautiful that she unconsciously pursues her with her eyes, and is uneasy about it. On the way to the bathroom, she secretly goes to see Rika's situation, and she comes across a decisive scene in which Rika is cheating on her. Takagi makes his emotions go out of control at the shocking fact...