MCY-0202 Sister-in-law, please don't

That evening, leaving drunk, the sister-in-law went straight to her brother-in-law's room instead of her own room. And then that night there were many moods, some happy: when the two told stories about their neighbors, some sad: when the sister-in-law said her husband often went to work until the next morning, and...
happiness exists: when the wife is so drunk, she can't tell whether she's with her husband or her brother-in-law, and so... of course they're both happy.