Moebius (2013)
A son bangs his father’s mistress and his mom gives him a hand job and would have had sex with him had his father not stopped it.
Actors: Seo Young-Joo
A Frozen Flower (2008)
A king’s bodyguard is tasked to copulate with the queen to produce an heir. The queen likes the sex so much that she starts screwing the bodyguard secretly out of their official copulation sessions.