His sister catches him in the sauna.

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

Enjoy.

>>>>

God, it was hot. I had been using my parent's sauna for a few months now, but hadn't gotten used to how damn warm it could get; maybe I never would...My younger sisters Valerie and Suzanne had never used it and my parents were maybe too old to be thinking very hard about health and fitness; they were happy that their son had been spending time using what had been a considerable investment.

I used it 3 or 4 nights a week, after...