I live with my parents, but I got a job and I'm going to move. The one thing I regret is that I haven't told my mother-in-law how I feel. But even though we're step-mothers, we're still mother and son. I can't confess my feelings... On the night before the move, I say my final goodbyes to my mother-in-law, but I can't bear the feelings and I confess. "Just once... I'll go back to normal after this," I say, and my mother-in-law hesitantly agrees to have sex. Because it's the first and last time, I get fired up all at once, and sex with her lasts until the morning.