Fortunately, Toni didn’t drink so was going to be the designated driver. I had no intentions of getting drunk either, so we figured we could attend...the party and if it turned out to be no good, we could quietly slip away together and do something more fun.The evening arrived and having showered and washed and wrapped my brown shoulder length hair in a towel, paused for a moment in front of the mirror. At 25, 5’ 4”, my C-cup breasts still fairly perky, I smiled and mentally complemented myself. She couldn't hold back any longer and let out a scream as she came, wrapping her legs round Joan and forcing the dildo as deep as it would go.Lisa flopped back, drained by the orgasm, Joan pulled out and lay down by Lisa's side. I just sat there, my cock hard and pulsing, I'd not touched it at all, for fear of cumming just from the sight of that action.Joan sat up, "Your turn Jack, step up."I climbed on the bed and straddled Lisa, she lifted up a little, presenting her sweet butt-hole, Joan. I sobered up a little and stood up straight and fed my drunken sister my hard cock in her mouth. At first, I had to force her lips open but when she knew it was me she opened up and started to give me a decent blow job, kind of like a drunk whore in an alley, the way I was viewing her now, that I could feel rising in my loins. I began treating my dear sister and earliest sex teacher the same way. I spun her around so her head was over the side of the bed and leaned down to her pussy and started. Almost as if my hands had a mind of their own, they made their way lower into her bra. I was cupping Samantha's amazing 32C breasts. Her nipples were fully erect and I pinched them lightly as I continued to fondle her melons.I noticed Samantha's breathing getting heavier and faster. She started undoing all the buttons on her blouse, and she let it fall to ground. She reached behind her back to undo her bra, and in one glorious snap, the full magnificence of her fabulous jugs were unleashed. .