Saturday night I stayed in to do some schoolwork while Megan went out with a girlfriend to the local bar. Around 1am I heard a car door slam and some giggling and I could tell Meg was a little drunk. She stumbled a bit as she walked to the door and couldn't seem to fit the key in the door. Afraid that mom and dad would hear her and find out that she'd been drinking, I ran downstairs and unlocked the door for her. Meg smiled when she saw me, and leaned in to kiss me on the lips before I had to push her away.
"Megan, mom and dad are upstairs and are probably awake now, we cant be seen doing anything with each other!"
She just kept smiling and started to inch up her super short "I'm a slut" skirt. I knew there was no reasoning with this girl so I threw her over my shoulder and brought her up to her room, where I told her to get undressed, get some water so she wouldn't be hung-over, and get to bed. Her intoxicating scent didn't go unnoticed by me as I started to get a hard-on while helping her to her room. Once she was safely on her bed, I told her to get undressed, and I went back to my room.
About ten minutes later, while I sat rubbing my cock through my shorts while pretending to do my work, Megan appeared at my door. My jaw dropped as I saw my hot little slut of a sister totally in the nude standing in the doorway for anyone to see.
"I got undressed like you asked; what now?"
She smiled as she cupped her massive tits (42DD, I checked a discarded bra in the laundry). She pushed them up with her tiny hands and stuck out her tongue so she was able to slowly lick her big nipples. My dick tented out of my jeans while she alternated back and forth between her tits sucking gently on each nipple until they stood hard and erect. I was so caught up in the show that I forgot my parents were down the hall and could come out anytime.
I whispered as loud as I could for her to get in the room and shut the door before they see but she ignored me and continued her show. She spread her legs and gave me a perfect view of her thick mass of hairy pussy.
"Let them catch me, I want them to know what a slut their daughter has turned into and how much she loves their son's huge prick."