Someone had left his diary on the living room table and you read it.
“It happened not long after we married, as soon as I showed the tiniest hint of jealousy. The wipping was harsh and long, meant to leave no doubt about who led our marriage and who was expected to obey at all times. And as the strokes of the riding crop marked my skin, she repeated several times, ‘you’ll lick his come on my pussy if I tell you to, don’t you? I want to hear you say that you’ll do it’, I thought she wasn’t meaning it but I was wrong.”
The parallelism between your father-in-law’s life and yours was striking and you decided that it wasn’t at all wise to challenge any of your wife’s or mother-in-law’s requests.