Meeting my cousin again after many years apart

He was on his way home from work when he happened to meet his stepsister Hikari Ninomiya. They had been apart for many years and seemed to have lost contact, but today they met again on the street as if by fate. They asked for each other's phone numbers and he invited his stepsister to his house for dinner. He is married and has a wife who is much older than him. So when he saw his step-sister being so beautiful and young, he felt extremely excited. And then the next day when his wife went to work, he and his stepsister had an affair not only once but many times after that.