Yan Jiaming really wanted to burst in and accuse her husband of being shameless, fucking even his sister-in-law.
But she didn't have the nerve to do that because she was guilty herself, no better, having been fucked by Song Tian, who had also fucked her daughter, and they'd been fucked together, mother and daughter.
Another important reason was that Song Tian was far away in the provincial capital; she couldn't get fucked by him whenever she wanted. It was an infrequent rough fuck, and that didn't quench her thirst on a regular basis.
Song Dayong's tool was big enough, and he was still in his prime and horny. He needed to fuck three or four times a week, each session lasting over half an hour, fucking her so good it was unreal. People who knew her said she looked healthier now than she did in her twenties.
So what was there to ask for? It's just sneaking a few bites here and there. Eat and let eat, it made them even.