My mother had a girlfriend who she had known from high school coming into town. My mother hadn't seen her in years so she invited her to stay with us while she was here. The first night was a real celebration which involved the 3 of us having a few drinks. It was around midnight when we all decided to get dressed for bed. We had been drinking and it didn't seem we would be going to be going to bed soon but figured it would be easier to be ready when we did. My mothers friend came back naked and asked if we slept naked too. I admitted I did and she convinced me to het naked too. My mother took more convincing but eventually gave in. There were the 3 of us naked together with my mother and her friend talking about old times. My mother was beginning to fall asleep and said she had better go to sleep. My mother and her friend were going to share my mothers bed and her friend said she would try to come in quietly so as not to disturb her. I offered her to stay in my bed so my mother wouldn't get disturbed and both my mother and her friend said that was it fine with them as long as I didn't mind. I had a queen size bed and had some of my girlfriends sleep in it with me in the past so it was no big deal. It was only an hour after my mother went to bed that we ended going to bed too. Once under the covers her friend begins to grab one of my breasts and then puts a hand between my legs and begins rubbing me. I began to realize this night was going to be different than when I had my girlfriends in my bed. With my girlfriend we had never been fully nude, always had panties on and never had any sexual contact. My mothers friend ended up with her head between my legs and her tongue was licking me both inside and out. I had never been with another woman before and this was so unexpected but with how I was feeling was not unwelcomed. I took my turn and got between her legs. I had never done this before so I was hoping I was doing a good job and with the way she was responding I think I was. We began kissing and fingering and sucking each others nipples and basically doing to the other what we wanted to. We eventually fell asleep and in the morning I was awoken with her tongue back inside my pussy. I then returned the favor and we fell asleep again. A little later I was awoken again with her tongue in me but this time when I was going to return the favor she stopped me and told me it was enough for now. She suggested we have a shower so into the shower we went. We began to fool around a bit and in walks my mother. It was a glass shower enclosure and she saw us kissing and a finger in the other. We didn't know how she was going to react so we just froze. She sat on the toilet, spread her legs and began to masturbate in front of us. We continued what we were doing and seeing my mother masturbating had us continue with no holding back. My mother watched as me and her friend used our tongues between each others legs and fingering each other along with everything else we ended up doing.
To keep a long story short my mother asked how long I had been gay and I told her it was my first time. She said with how we were going at it it was not going to be my last time. She only stayed the one night and my mother never mentioned what she saw to me again.