“Yes,” she replied without a second of hesitation.“Ok sis,” I began as I thought out what I was going to command her to do. “In the evening...s, after you finish your walk, you are to get your vibrator and masturbate until you cum.”“I already do that,” my sister replied without a hitch.“Ok then. From now on, after your walk, you will become extremely horny and you will masturbate until you cum five times. Is that clear?” I know that might have been a bit excessive, but she would definitely. And, that's when the hunger hit me! That deep yearning to ravish her feminine under-clothing. Something, coincidentally enough, I had already done with her mum's, a few months prior to this, when she had taken a shower downstairs and left a freshly-worn pair of knickers in the dirty clothes basket. I sniffed, sucked, fucked and spunked inside of them within about five minutes flat! Desperate to inhale Yvette's scent and to rub my cock where that delectable, pussy-meat, had been, only moments. I just couldn’t get enough of her boobs and somehow she managed to push me down and started doing something which I couldn’t believe at that moment she put my penis in her mouth for the first time and started sucking it.First word from my mouth was fuck not only she was sucking it. I felt that she wanted to suck it and was pretty much enjoying it by this time I got the Idea that how the rest of the day will go. I was almost nearing my orgasm that’s when I stopped her and started kissing her and. "Oh God yeah!" Jack said, high pitched, as he became faster in his own thrust.Jacks cock was leaking precum at such a rate, I thought he'd already ejaculated, until he stopped, leaving his cock on my tongue."Suck it, really hard. Suck it now."I did as I was told, I sucked as hard as i could, like i was trying to suck up a really thick milkshake, and on about the fourth time, a warm, thick wash spread all around my mouth, I stopped sucking and a shot of cum sprayed across the roof of my mouth, I.