Mom fucked her adopted son to get pregnant

This husband’s wife had adopted a boy. The boy had now started going to college. But the wife wanted to have a son of her own. The husband tried to convince her alot, but she didn’t listen.
The son secretly listened to both of them. Then dad gives him the idea of fucking his stepmom and getting her pregnant. He also convinces his wife for this. Then he leaves both of them alone in the bedroom. Then they had sex together. In the end the son releases his seed in her pussy.