My gf's mom was a very hot woman, I thought she was an older sister. One night we were at my gf's house, and her mom came home from visiting with some of her female friends, and she had a few drinks and was feeling horny. She had been a single mom for about 3 years. She was rather suggestive with several of the things she was saying, and my gf said to just try to ignore her since she got that way after drinking. My gf had to go to the bathroom and as soon as she left the room, her mom stipped down to bra and panties and asked me if I thought she still had a good body... well I thought it was a great body and I told her so... she came over to the couch, straddled me, had her arms around my neck and gave me a big kiss. She started gyrating on my lap and I couldn't help but cup her ass. My gf walked in and caught us, but her mom was raring to go, I had a tremendous hard, and my gf went back to her room, mad. Her mom got my dick out and then into her pussy, and we were griding away, then we moved to doggy style, and finally she was on her back with her legs over my shoulders... that's when my gf came back in the room and although she said it was disgusting at first, she said it was also hot to see my pumping her mom fast and furious. My gf strippled down, and althoug they didn't touch each other much at all, they both were working me.