I followed her everywhere to get an opportunity to view her cleavage. She showed it at every opportunity and I admired and got crazy thinking about he... breasts. She was sixteen but her breasts were really big and sexy. At every opportunity my hand touched her breasts, though it lasted for a second, as if happened unintentionally. She too waited for these accidents. Days and months passed remaining ourselves outwardly sister and brother but inwardly lovers. I masturbated fantasizing our. Mehra by her head with the chain to stop her head just at my gigantic bottom. I pulled the chain harder to forcibly rub her face on my ass, she had tears flowing down her cheeks. She started to kiss my shiny latex covered butt. I kept her head stuck to my butt.I held her husband's dick in my palms before speaking, "Condom?" I said to him. He just leaned in at the side drawer of the bed to open it and take the packaged rubber cylinder out. I undid it from the pack to roll it over on his penis. I. Good thing you didn't, you know how picky Janet is about her floors," I chuckled trying to make light of it."So ... we weren't too noisy coming in then?" She again pressed."Didn't hear a thing," I assured her. Once again she sat looking over the rim of her cup at me as though trying to digest that. I could feel sweat starting to form on my forehead."Going to be a hot one today, already starting to feel it," I told her wiping my brow. We both looked over at the thermometer hanging on the wall. Trudi explained that we were just fooling around had done nothing that could be construed as actual sex in any sense of the word. My sister was acting real unconvinced but I knew her pretty good and I could tell she was just jerking Trudi's chain to make her do her a favor later on to make up for her "slutty" behavior with her younger brother.Anyway, she was on a promise to actually "do it" the next time and I was certain she would give it up without much difficulty judging from the way she put.