You have been living in a seemingly happy, "normal" relationship with your other half. This changes one night after falling foul of your particularly strict in-law. Rather than running to tell your partner what just occured you find yourself drawn into an illicit relationship with them. How long can the affair last before the secret is discovered? And if forced to, who will you choose?
There aren't too many rules to this. This is designed to be M/M, M/F, F/F or F/M, whichever your preference may be (I'm open to any of those personally). This is intended to involve bondage and spanking as well as any sex, so if that doesn't appeal to you then I won't feel offended if you ignore this idea.
If you have any questions, reply/PM me and I'll be happy to answer