Shortly after seeing it we saw movements under her blanket and an orgasm face that she tried to hide. We were both 19 at the time, but more often than not she would "play" 16.
When leaving their house often late at night I would use the basement door.
One night shortly after I left their house , I noticed that I forgot my wallet on the coffee table downstairs so I drove back to her house going back through the basement door that was not locked to discover my girlfriend sister legs open masturbating.
She reached me later that day to offer me to go hiking at a nearby trail in the afternoon and went for dinner at the end of the day.
She was pleasant to talk and somehow I had a pleasant weekend.
The next weekend I go back to the same bar as the previous weekend and she came to chat with me.
Shortly after she invited me to go to her place to talk in a less noisy environment.
When we got home we sat on the couch and she kissed me right away and I think when she saw that I was starting to have a hard on she took my penis out to her mouth for a few seconds and stopped to take off all my clothes and took her clothes off and just sat on my penis that just slipped easily down deep inside her while saying I have been waiting all week to have you in me again.
Her pussy was dripping wet and she was passionately going up and down over my penis within minutes I felt her coming hard and she got off my penis without me having an orgasm but she kept me hard alternating slowly and gently with her hand and her mouth on my penis( felt more like a tease ) for a minute or two and she jumped over me again and rode me to a big orgasm.
She was not the most beautiful girl , she was the curvy type and I like more the slim type but I decided to accept the invitation for the night.