Son has 3some with his mom and dad's mistress

[TexMan324]

Mom finds out about her husband's mistress. She confronts her. Sexual tension grows between the two. Mom and mistress get naked and have lesbian sex. Son walks in on them 69ing each other. To keep quiet, son strips naked and joins mom and mistress in 3some. Mom and mistress rides son's cock and tongue as they share a sapphic kiss.

Mom divorces Dad, steals and marries his mistress, son moves in with his two moms. Mistress reveals daughter who is son's age. The foursome, mom, son, dad's mistress turned mom's new wife and son's second mom, and mistress's daughter, live a fully-nude sex positive lifestyle without shame.

 

[Rob_Royale]

Or

Mom finds out about her husband and confronts mistress. Son finds out and sets out to confront his cheating dad and finds the mistress at a bar waiting for his dad. After seeing the stunning young woman he changes his mind and starts up a conversation with her. Turns out she's not all that into the older guy and happily leaves with the handsome and sucesssful son.

An hour later he's balls deep in the mistress and his dad calls. At first the woman is keen to ignore the call but he tells her to take it.

He keeps pumping into her and tells her, "Tell Dad that Tommy says hello."

Son marries mistress, Mom divorces dad. Son and mom live happily ever after.