My Sister Debra

I'm John 26 youngest of three, my brother Bruce 31 (oldest) is in the army and overseas. Then there is Debra 28 who I thought was a lesbian, but last month I found out she was into Zoophilia. She lives on the outskirts of our town away from the extended family, she like me has a large trust fund to keep us. I went out on the spur of the moment to see her and asked her about staying with her a couple of days as home was being treated for a spider infestation and our parents would away. I walk to her door it was ajar and I entered and found Debra with her dog Robbie Great Dane fucking her. She was shocked at being caught, but couldn't do anything till Robbie finished. At first she was angry at me for just walking in, but calmed down and asked me not to say anything to anyone about her and Robbie. I told her I would keep her secret and then told her why I was there. I could stay at our parents place, but as they are so fussy about everything. I didn't want the grief of them on there return on any little thing that was moved or marked in some minor way. She knew how I felt and said I could stay, then she asked me to join her in the shower. Why do you want me in the shower with you I asked. Insurance was she replied, so I joined her in the shower and she washed my back and I hers. Then she grab my cock and started to stroke it, it soon was hard and then she said I could fuck her. So I did and after we went to her bed and fucked again. I told her I liked her insurance, she smiled I will let you fuck me anytime and it will be our secret. I told I thought her a lesbian, as I had never seen her with a man only women. She replied She liked Men, Women and Robbie and now I was her plaything. I stayed with her for two weeks and fucked her almost every day. She introduce me to her friend Megan 25 her hairdresser and even got her into bed with us for a threesome. I am still seeing Megan now I'm back in my own place and Debra come over for sex as well. My mother Ruth dropped by last Friday morning and almost caught me fucking Debra, but my parrot Winston warned us by saying Mummy here. and Debra ducked into a bedroom to dress and I put on my pants and shirt. I met Ruth at the door shirt undone and let her in. Debra stayed in the room until Ruth left and then we had sex again. Megan is coming over tonight as she is thinking of moving in with me and is staying to Sunday, if she enjoys her stay she will move in fully.