I Want My Girlfriends Sister Bad

Years ago I was 20 and my girlfriend was 18, we were left home alone. We fucked in every room that day but when we got to her little sisters room, a switch flipped. I couldn’t stop imagining her sister while fucking her on the bed. I got more wild and much more horny despite having had sex a couple times prior. I looked up and saw a picture of the sister and that’s when I lost all control. I stared intently at the picture for moment and blew a good load into my girl imagining it was her sister I was looking at. I always wanted her from then on and still do to this day.