I got home around dinner time, Mom had made us a great dinner which we all enjoyed. Then Mom went and told us about her date, and told us that she was bi-sexual and had been most of her life, but had not had a girlfriend in a long time. She told us that last night was the first time with her friend and that they both had multiple orgasms. Mom was being very open about her experience and told us we can ask her anything and she would try to answer them. Sis asked how old she was when she lost her virginity and how old when she had her first bi experience. Mom's answer was virginity lost at 16 and first bi at 22. She told us that if we wanted to try bi-sex she would not get mad at us and that she would support us. I had many questions of my own, like was it just oral sex and kissing or were toys involved. Mom started laughing and said yes, yes and Oh yes. She then went to tell us a lot about her sexual experiences from losing her virginity to her date last night. It was close to midnight when we all went to bed and me with a raging hard on I was going to have to take care of.
I woke up to the smell of bacon cooking and as I walked into the kitchen Mom was cooking breakfast for not just but someone I did not know. I was then introduced to her date from the other night, Helen. She was a beautiful woman about my Mom's age with a great body. Helen got up from the table and came over and gave me a big hug which I did not expect. Then I got another surprise when Mom said that Helen was going to be staying with us for a little while and would be sleeping with her. I was like Ok, this is getting weirder every day. Sis decided to the walk into the kitchen in nothing but panties, see Helen and takes off on a run back to her room. Me, I'm standing there in boxers and a t-shirt so yeah it is getting weird.
The day went on with all four of us wearing very little clothes, Mom and Helen kissing and cuddling in front of us and me trying not to get another hard on. After dinner, I went up to my room just to get away from all the lovey dovey stuff going on and to have some time to myself. I was thinking I needed to jerk off when my Sis walked in on me with my cock in my hands. She told me not to stop that she wanted to watch and then let me watch her. So I went and sat on my bed with my sister right next to me as I beat off and when I came I shot my load all over my legs and stomach. Sis just sat there smiling, topless still just wearing panties.
After I came, Sis pulled off her panties and told me it was her time to cum and how bad she needed too. She spread her legs so I could get a look at her playing with herself. One thing I noticed since the last time I saw her pussy was that she had trimmed up her pubic hair. She started to very slowly massage her clit and pussy lips and picking up the speed of which she did. Her other hand was tweaking her nipples which were hard as small pebbles. The she slipped first one then two fingers into her vagina as her orgasm swept over her and she came. By now I was hard again from watching her and had started to slowly stroke my hard on.
Sis's orgasm must have been loud as both Mom and Helen came running into the room. Mom was asking if everything was okay and Helen just stood in the doorway smiling. Once Mom and Helen saw what was happening they both seemed to relax, me sitting her with cum all over me and Sis with two fingers still inside of her. Helen said she was headed to bed as Mom came in and sat on the side of the bed. She asked if this was the first time we had done anything like this and we both told her no. Sis admitted to having given me a blowjob and I said I had eaten her out once. To my surprise Mom was not mad at all. This is when she told us that her and her brother had played too when they were younger. She then told us to both go shower and get cleaned up and then go to sleep and we will talk more in the morning.
