I was nineteen and had just finished my freshman year in college. I spent the summer with my college roommate's family in New Orleans because I didn't want to go home to my own family. The family I was living with had a daughter, Madison, who had just turned eighteen. We had become flirtatious with each other over several weeks, yet we were never really alone together so we could never do much more than give each other sexy eyes.
One afternoon, we all decided to go to the movies. When we arrived, there weren't many people in the theater and the back several rows were completely open. So my friend and his girlfriend decided to sit on one side of the theater and that left me and his sister finally "alone" together. She grabbed my hand and pulled me over to the far side of the theater.
There wasn't a person within ten rows at least. I honestly have no recollection of what movie we saw because all we did the whole time was make out and talk about how much we liked each other. The buildup had been excruciating--and of course, I had masturbated several times over the past few weeks thinking about her.
As our make-out session progressed, she told me that she had felt pretty horny while she watched me give her the sexy eyes several times. She asked me if I had gotten horny too. I told her that absolutely I had. She asked me if my cock had gotten hard. I easily admitted so and told her that I had masturbated thinking about her. She blushed (I think she did anyway...it was kinda dark) and whispered in my ear in the sexiest, sultry voice that she had rubbed her pussy every night while I was there imagining what my cock looks like.