Drunk siblings experiment

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

Enjoy.

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The following story took place about 8 years ago and it developed into a 6-year sexual relationship between my sister (then 26) and me (then 23).

We had both just returned from a cousin's wedding reception and man, were we buzzed. OK, drunk. 'Jess' had moved out of the house a few years earlier but was staying at the family homestead for the wedding weekend. Our parents had left the reception hours earlier, perhaps a bit tipsy themselves, and were snoozing peacefully in their 2nd floor bedroom...