My Girlfriend And Her Sister Made Me A Pervert

This happened back in the 70s my then girlfriend and I were 16 and started having sex. We had a lot of good times and were smart enough to use protection. One day her younger sister that was about 13 caught us and said if we didn't let her watch she'd was going to tell mom. So we continued me eating her pussy and her sucking my dick. I then put on a rubber and we started fucking. Her younger sister was watching wide eyed and started taking her clothes off she had tiny nubs for tits and an almost bald pussy. I was getting close to cumming pulled out took the rubber off and came all over my girlfriends stomach. Her sister was in shock and asked if I could do it again being 16 that was no problem. My girlfriend began blowing me and I was rock hard again this time I came in her mouth and she let some dribbling down her chin. Her sisters wanted to try that and I said in a little while. After an hour or so we started again they took turns sucking me while I rubbed one then the other I started licking the younger ones pussy and she was so wet and sweet tasting. I found her tiny clit and worked it with my tongue she started having fast hip movements and had an orgasm and she said that she had never felt anything like that. I put my dick in the younger ones mouth and came in her mouth she swallowed as much as she could and said it tasted funny but wasn't that bad. We had a lot of great fuck sessions over the next few years I never penetrated the younger one I saved that for herself future boyfriend