The key to good eavesdropping is...

NB: This story contains mature themes of erotic sex, incest/taboo sex and of an adult, explicit, SEXUAL nature.

Enjoy.

>>>>

Until last week my relationship with son-in-law Mark had been a model of propriety and I've only got myself to blame for that changing. My staying over with he and my daughter Julie was far from unusual -- their house provides a handy base for shopping trips to the city -- similarly, they and quite often Mark alone, will spend the night at our house; Mark's been dealing with a project that's near to our home, so has stayed with us one and sometimes...