The neighbor secretly cheated on the neighbor's sister and got pregnant

A single mother moved into the room next to the rundown apartment where I lived. She has a gentle demeanor, but for some reason she always smiles sadly. I worry about her, when I need a man's hand I help, conversely when I'm sick I ask her to take care of me. The peaceful days continued, but suddenly one day her ex-husband suddenly came to her. I couldn't stand her, injured but healthy, and I hugged her madly. The sexual passion of two people seeking each other.