Names are altered for obvious reasons. Mistakes and bad wording probably are because English isn’t my first language.
I am an archaeologist and was on a longer job ways away from where I normally live and work. And stayed at Mary’s, my fiance’s sister, place, because she had a spare room at the time, after her roommate had moved out.
Mary is in her mid-twenties, athletic and redheaded. Aside from minor differences and her hair color she looks a lot like her sister. So it is safe to say I find her very attractive as well,
On the few occasions I have met Mary we actually got along quite well. We were never really alone with each other before.
After a long work day, I went out with some colleagues from the excavation I was working at. After drinking my fill I took a taxi to Mary’s appartement.
She was sitting in her living room on the couch, watching TV. In my drunk state I joined her on the couch after a short while we were joking around. We talked about my fiance’s joke, when she arranged for me to stay at Mary’s, that I shouldn’t try to seduce her sister. Mary joked maybe she should try to seduce me then, as that had not been forbidden.