I'm not sure were I read it, but I'm I had read a story about a teenage-ish boy who wet his diapers and his mother put him back in diapers. She hid it from his father, who was abusive and would be angry if he found out. He then found out had sex with the mom in front of the son and pushed her face into his dirty diaper. There was more after, but I didn't get a chance to finish reading.
Does anyone know the name of this story?