This went on for a little while before he once again ran his helmet up my pussy over my moist lips. This time, instead of stopping at my dripping hole...he carried on up and instead stopped at my tight brown ass hole. I braced myself as he eased his thick spunk covered cock past my ass hole and slowly slid his length inside me. Just when I thought I couldn’t take another inch I felt his heavy balls rest against my pussy lips. He gave me a few seconds to get use to the sensation of his huge cock. "Hey, do you need any help?" I asked expecting someone else to appear out of the bushes.“Oh thank god you came back, I thought I was gonna be here all night"!”He looked a little distressed so I started to untie the ropes around his hands then sank to my knees and started to undo the ropes around his legs. I looked up and saw the bulge in his tight silk panties. He wasn't hard but they were so small his cock made them bulge. He told me that some guys at a club had invited him to a fetish party,. Knowing he was Susan's I declined the invitation. He called me twice a week for the next month and I kept politely turning him down. One day when he called I flat out asked him not to call me again, "I'm not in the habit of dating my sister's boyfriends." Is that what's been the problem? It shouldn't be, I haven't seen Susan in months."That night after work I stopped by Susan's to visit and I asked her how she and Harry were getting on."We aren't. He told me that he didn't feel that we were a. . well why don't you come upstairs and see for yourself then? She turned and headed for the staircase, and I followed her perforce. We kept bumping into each other all the way up the stairs, and I started to hush her when we reached the landing so that we didn't wake Janet. She brushed me off sharply. "You couldn't get her up with a cattle prod; now quit being such an idiot."Upon entering my wife's bedroom, I was immediately struck by the overwhelming pungent smell of sex. Janet had kicked off.