I was at home the next day when I got an unexpected knock on the door when I answered it there to my surprise stood Sheryl "hello Sheryl what the hell...are you doing here" I exclaimed smiling at the same time"hello Simon Im sorry to bother you but I really need to talk to you" she shuffled from foot to foot appearing quite nervous,"come in" I said and followed her through to the front room I made her a cup of tea while we chatted about small stuff, work, Steve etc then we both sat down and I. The wine, and to some extent the shared ‘naughtiness’ of sneaking around, contributed to us moving closer together, till her legs were draped over mine and we were talking from inches away. I felt a stirring downstairs, but I tried to ignore it. Just when I thought we might be in danger of kissing, she took a deep breath and asked me if I would rub her back. Without waiting for an answer, she turned around and put her arms on the side of the hot tub, resting her chin on her forearms. It was. On the way to the apartment building Linda had described to him, he contemplated once more the fact her husband had bought a condo for her where she could discreetly meet her lovers. He didn’t want her to be seen meeting men in public, in hotels or elsewhere. The building had a convenient underground car park for discretion with elevators to the floors. Linda had him provided with her spare remote control to open the gate. It was not a long drive and, twenty minutes later, he stood before her. Not a simple cry of release, but an almost bloodcurdling scream that rattled the windows in the room as she came.And then I felt it ... as I heard Jack's deep-throated moan of enjoyment. His cock lurching, suddenly throbbing, and I knew he was just then spurting, filling our sister's bowels with his semen. I came ... explosively. I felt my cock literally balloon inside her, and then the jettison of spunk, which came in torrents, or so it seemed anyway. I flooded her pussy, as Jack flooded her.