The girls were wearing their skirts and I was wearing shorts with baggy legs. As soon as I got a little hard, the head of my cock extended down and st...ck out just a little. The girls had opened their legs exposing their cunts and asses to the gazes of passersby.No one did anything but look. It got darker and we went inside. The girls stripped and got on the bed fondling each other. Nats soon had three fingers in Abigail’s ass. I pushed my cock into Nats’ cunt making her moan as she stretched to. He grinned and said “he missed his mums body, but hers would do as a stand in, if she wished to share it at any time…” somewhat shocked, she said a fit lad like him would not be wanting an old bird like me and not to be so bloody cheeky…” he grinned then said in all seriousness, “Only when you ask me aunty Maj, and not until, I wouldn’t just take you, though you do look like my mum with less of a tan and I do fancy you!” Blushing now she treated it like a joke and said, “Get off with you you`ll. When we got home she would be blind folded and sit "O" style(that is lift her skirt so her bare arse and pussy are on the chair) As I looked into her eyes I told her I would get out her toys and lay them out and that she was then going to have the blindfold removed and she was going to bring herself to orgasm while I watched. I would only help if she asked. She would masturbate for me and she was not to close her eyes but to look at me all the time. She headed off to the toilet while I sat. Then John just looked at us."Hey, this is between you two, you gotta decide what you want, you wanna get your sister pregnant someday?" I asked John.I think he just didn't know what to say, he wasn't sure what he wanted then, well he had a n idea, it was her. Obviously I knew what it was like to have a wonderful brother that loves and respects the hell out of you, no matter what. One of us should have told her to at least stop stoking his cock while he thought about this, but I think at least.