His wife has a female colleague she gets along with well, and the woman often comes over to her house to mooch meals.

The colleague is a little chubby and has never had a partner; people have introduced her to a few, but none of it worked out.
One time, she came over again and said, pitifully, that she might be single for the rest of her life.
He joked, saying: It’s fine—if no one wants you, I’ll take you as a concubine and accept you.
His wife looked down on him and said, You should see what you’re like.
With a one-bedroom, one-living-room apartment, where would the three of you live?