When I was about 20 or 21 my 18 year old girlfriend, her 15 yr old sister and I were watching a movie on TV. Me and my GF were on the couch covered by a blanket and her sis was on a chair opposite. My gf pulled my trackpants down and started wanking me under the blanket - when I was hard she stood up suddenly letting the blanket fall away and exposed me to her sister. She then sat back down and covered me up but she wanked me until I came while her sister watched out of the corner of her eye.
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