My Grandmother continued

I started fucking my gran Ruby after she moved in with us after a bad storm. I continued to fuck her regularly after she returned to her own home and my mother Cheryl caught us and soon after I was fucking her as well. Then last week I was out at the party of an old school friend and my sister Leanne 18 was also there seeing my friend's sister Rachel 18. The drinks were flowing freely and Leanne got drunk, so I decided to take her home. We got home just after midnight and I put her on her bed and was just leaving when woke up and asked why I was leaving. I answered so you can sleep, she responded aren't you going to fuck me as you do Grandma and Mom. I was shocked at her knowledge and asked how she knew about me fucking both of them. I stayed over at grandma's in February and she talks in her sleep. What about me fucking mom how do you know about that I asked. Grandma mentioned both of you and talked about the 2 of you fucking hard and I want you to give the same as you give them and if you please me, I'll get you into Rachel's pants also. What makes you sure Rachel would want to be fucked by me I asked. I'm sleeping with her and we are both bi-sexual and I'm sure she would like a man for a change she replied. As both our parents were away I decided why not and I join Leanne in her bed and fucked her twice before going to sleep together. Near midday, I awoke and shortly after Leanne awoke also and I mounted her again and after we showered together and went over to Grandma Ruby's house and continued there. Leanne has started to come to my room for sex after our parents are asleep for sex. Our mother Cheryl knows I'm fucking Leanne as Ruby told her and doesn't approve totally and hopes that we will find other sexual partners in time. As yet I haven't fucked Rachel yet, but Leanne is getting her to hang out with us both more often now.