Revenge of the Retired Tutor

Marcel Donnels was already retired. Or so he thought. However, when a gorgeous young woman showed up abruptly at his house wanting him to tutor her, he couldn't resist. After all, he was lonely and didn't mind having a little female companionship. Besides, she kissed him and he really liked it too. The relationship did end up being romantic, but would she eventually become tired of Marcel? He was, after all, twenty years older than her... How would Marcel get revenge when he found out she was cheating on him?