While his wife is away on a solo trip, a man begins a forbidden affair with her adult sister Karen. As his marriage grows colder, he can no longer resist her temptation. “Your wife is probably cheating too,” she whispers before they lose themselves in passionate sex. The guilt only makes his self-control disappear faster. He devours his sister-in-law's irresistible body and creampies her repeatedly—morning, noon, night, and the following morning. Unable to stop craving each other, they want to remain joined as guilt and bliss melt away every rational thought.