She slid off her other strap, letting her dress slide down to her waist and unsheathing her second jug. I laid back a bit more and she held my head cl...ser to her shoulder so my face was in her right bosom. I latched on and sucked on her nipple, quickly drawing milk, her left hand caressing my stomach while I drank my fill. I moved my hand from her side and onto her left breast, gently squeezing and feeling her firm mammary. I felt her warm hand slowly make its way down my stomach, her fingers. Cindy stopped for a moment and I heard her mutter about how sexy this was. She began pushing again. She started a slow rhythm of pushing about the same distance into me four or five times and then slightly increasing the depth for the next handful or thrusts. It took her a full five minutes to increase the depth to about 7 inches. The girth of the cock was stretching me wide and was getting wider the deeper she went. I laid there and tried to relax as she got deeper and deeper. It seemed to. "Take that underwear off let me see."I hesitated. "No way i can compete with that thing" I thought to myself."I know I'm kind of a size queen" she shrugged. "I'm just curious. I don't expect you to be nearly that big." With that encouragement i Stood up and slipped down my underwear. Revealing my very average 5" penis. Despite her promise my sister began giggling. "I was hoping it was at least above average." She said sitting on the corner of the bed. "Let me see it more closely." As I came. I pulled my under shirt over my head while unbuckling my pants. My clothes flew everywhere as I frantically undressed. My cock was throbbing, I had to have his dick in my mouth now. I stripped down to my briefs and then realized I had never been naked in front of another man. It hit me for a second just how far I was going.But it was only for a second and then the pulsing of my erection made me not care. I wanted to be naked in front of my master. Having his cock was the only thing I cared.